diff --git a/Data/Scripts/001_Settings.rb b/Data/Scripts/001_Settings.rb
index 4874caa46..ec6a454c5 100644
--- a/Data/Scripts/001_Settings.rb
+++ b/Data/Scripts/001_Settings.rb
@@ -5,6 +5,9 @@
 #==============================================================================#
 
 module Settings
+  # The version of the game. It has to adhere to the MAJOR.MINOR.PATCH format.
+  GAME_VERSION = '1.0.0'
+
   # The generation that the battle system follows. Used throughout the battle
   # scripts, and also by some other settings which are used in and out of battle
   # (you can of course change those settings to suit your game).
diff --git a/Data/Scripts/001_Technical/010_Validation.rb b/Data/Scripts/001_Technical/010_Validation.rb
index 0714d1368..e3c23ccca 100644
--- a/Data/Scripts/001_Technical/010_Validation.rb
+++ b/Data/Scripts/001_Technical/010_Validation.rb
@@ -2,13 +2,13 @@
 module Kernel
   private
   
-  # Used to check whether values are of a given class or respond to a method.
+  # Used to check whether method arguments are of a given class or respond to a method.
   # @param value_pairs [Hash{Object => Class, Array<Class>, Symbol}] value pairs to validate
   # @example Validate a class or method
   #   validate foo => Integer, baz => :to_s # raises an error if foo is not an Integer or if baz doesn't implement #to_s
   # @example Validate a class from an array
   #   validate foo => [Sprite, Bitmap, Viewport] # raises an error if foo isn't a Sprite, Bitmap or Viewport
-  # @raise [ArgumentError] raised if validation fails
+  # @raise [ArgumentError] if validation fails
   def validate(value_pairs)
     unless value_pairs.is_a?(Hash)
       raise ArgumentError, "Non-hash argument #{value_pairs.inspect} passed into validate."
diff --git a/Data/Scripts/007_Events and files/001_Save data/001_SaveData.rb b/Data/Scripts/007_Events and files/001_Save data/001_SaveData.rb
new file mode 100644
index 000000000..393bd2cf3
--- /dev/null
+++ b/Data/Scripts/007_Events and files/001_Save data/001_SaveData.rb	
@@ -0,0 +1,106 @@
+# The SaveData module is used to manipulate save data. It contains the {Value}s
+# that make up the save data and {Conversion}s for resolving incompatibilities
+# between Essentials and game versions.
+# @see SaveData.register
+# @see SaveData.register_conversion
+module SaveData
+  # Contains the file path of the save file.
+  FILE_PATH = if File.directory?(System.data_directory)
+                System.data_directory + '/Game.rxdata'
+              else
+                './Game.rxdata'
+              end
+
+  # Compiles the save data and saves a marshaled version of it into
+  # the given file.
+  # @param file_path [String] path of the file to save into
+  # @raise [InvalidValueError] if an invalid value is being saved
+  def self.save_to_file(file_path)
+    validate file_path => String
+
+    save_data = self.compile
+
+    File.open(file_path, 'wb') { |file| Marshal.dump(save_data, file) }
+  end
+
+  # Fetches save data from the given file.
+  # @param file_path [String] path of the file to read from
+  # @return [Hash] save data in Hash format
+  # @raise (see .get_data_from_file)
+  def self.read_from_file(file_path)
+    validate file_path => String
+
+    save_data = get_data_from_file(file_path)
+
+    save_data = to_hash_format(save_data) if save_data.is_a?(Array)
+
+    return save_data
+  end
+
+  # @return [Boolean] whether the save file exists
+  def self.exists?
+    return File.file?(FILE_PATH)
+  end
+
+  # Deletes the save file (and a possible .bak backup file if one exists)
+  # @raise [Error::ENOENT]
+  def self.delete_file
+    File.delete(FILE_PATH)
+    File.delete(FILE_PATH + '.bak') if File.file?(FILE_PATH + '.bak')
+  end
+
+  # Fetches the save data from the given file.
+  # Returns an Array in the case of a pre-v19 save file.
+  # @param file_path [String] path of the file to load from
+  # @return [Hash, Array] loaded save data
+  # @raise [IOError, SystemCallError] if file opening fails
+  def self.get_data_from_file(file_path)
+    validate file_path => String
+    save_data = nil
+
+    File.open(file_path) do |file|
+      data = Marshal.load(file)
+
+      if data.is_a?(Hash)
+        save_data = data
+        next
+      end
+
+      save_data = [data]
+
+      save_data << Marshal.load(file) until file.eof?
+    end
+
+    return save_data
+  end
+
+  # Converts the pre-v19 format data to the new format.
+  # @param old_format [Array] pre-v19 format save data
+  # @return [Hash] save data in new format
+  def self.to_hash_format(old_format)
+    validate old_format => Array
+    hash = {}
+
+    @values.each do |value|
+      data = value.get_from_old_format(old_format)
+      hash[value.id] = data unless data.nil?
+    end
+
+    return hash
+  end
+
+  # Moves a save file from the old Saved Games folder to the new
+  # location specified by {FILE_PATH}. Does nothing if a save file
+  # already exists in {FILE_PATH}.
+  def self.move_old_windows_save
+    return if File.file?(FILE_PATH)
+    game_title = System.game_title.gsub(/[^\w ]/, '_')
+    home = ENV['HOME'] || ENV['HOMEPATH']
+    return if home.nil?
+    old_location = File.join(home, 'Saved Games', game_title)
+    return unless File.directory?(old_location)
+    old_file = File.join(old_location, 'Game.rxdata')
+    return unless File.file?(old_file)
+    File.move(old_file, FILE_PATH)
+  end
+end
diff --git a/Data/Scripts/007_Events and files/001_Save data/002_Values.rb b/Data/Scripts/007_Events and files/001_Save data/002_Values.rb
new file mode 100644
index 000000000..39c816c65
--- /dev/null
+++ b/Data/Scripts/007_Events and files/001_Save data/002_Values.rb	
@@ -0,0 +1,264 @@
+module SaveData
+  # Contains Value objects for each save element.
+  # Populated during runtime by SaveData.register calls.
+  # @type [Array<Value>]
+  @values = []
+
+  # An error raised if an invalid save value is being saved or loaded.
+  class InvalidValueError < RuntimeError; end
+
+  # Represents a single value in save data.
+  # New values are added using {SaveData.register}.
+  class Value
+    # @return [Symbol] the value id
+    attr_reader :id
+
+    # @param id [Symbol] value id
+    def initialize(id, &block)
+      validate id => Symbol, block => Proc
+      @id = id
+      @loaded = false
+      @load_in_bootup = false
+      instance_eval(&block)
+      raise "No save_value defined for save value #{id.inspect}" if @save_proc.nil?
+      raise "No load_value defined for save value #{id.inspect}" if @load_proc.nil?
+    end
+
+    # Calls the value's save proc and returns its value.
+    # @return [Object] save proc value
+    # @raise [InvalidValueError] if an invalid value is being saved
+    def save
+      value = @save_proc.call
+
+      validate_value(value)
+
+      return value
+    end
+
+    # Calls the value's load proc with the given argument passed into it.
+    # @param value [Object] load proc argument
+    # @raise [InvalidValueError] if an invalid value is being loaded
+    def load(value)
+      validate_value(value)
+
+      @load_proc.call(value)
+      @loaded = true
+    end
+
+    # @param value [Object] value to check
+    # @return [Boolean] whether the given value is valid
+    def valid?(value)
+      return true if @ensured_class.nil?
+      return value.is_a?(Object.const_get(@ensured_class))
+    end
+
+    # Calls the save value's load proc with the value fetched
+    # from the defined new game value proc.
+    # @raise (see #load)
+    def load_new_game_value
+      unless self.has_new_game_proc?
+        raise "Save value #{@id.inspect} has no new_game_value defined"
+      end
+
+      self.load(@new_game_value_proc.call)
+    end
+
+    # @return [Boolean] whether the value has a new game value proc defined
+    def has_new_game_proc?
+      return @new_game_value_proc.is_a?(Proc)
+    end
+
+    # @return [Boolean] whether the value should be loaded during bootup
+    def load_in_bootup?
+      return @load_in_bootup
+    end
+
+    # @return [Boolean] whether the value has been loaded
+    def loaded?
+      return @loaded
+    end
+
+    # Uses the {#from_old_format} proc to select the correct data from
+    # +old_format+ and return it.
+    # Returns nil if the proc is undefined.
+    # @param old_format [Array] old format to load value from
+    # @return [Object] data from the old format
+    def get_from_old_format(old_format)
+      return nil if @old_format_get_proc.nil?
+      return @old_format_get_proc.call(old_format)
+    end
+
+    private
+
+    # @!group Configuration
+
+    # Defines what is saved into save data. Requires a block.
+    # @see SaveData.register
+    def save_value(&block)
+      raise ArgumentError, 'No block given to save_value' unless block_given?
+      @save_proc = block
+    end
+
+    # Defines how the loaded value is placed into a global variable.
+    # Requires a block with the loaded value as its parameter.
+    # @see SaveData.register
+    def load_value(&block)
+      raise ArgumentError, 'No block given to load_value' unless block_given?
+      @load_proc = block
+    end
+
+    # If present, sets the value to be loaded during bootup.
+    # @see SaveData.register
+    def load_in_bootup
+      @load_in_bootup = true
+    end
+
+    # If present, defines what the value is set to at the start of a new game.
+    # @see SaveData.register
+    def new_game_value(&block)
+      raise ArgumentError, 'No block given to new_game_value' unless block_given?
+      @new_game_value_proc = block
+    end
+
+    # If present, ensures that the value is of the given class.
+    # @param class_name [Symbol] class to enforce
+    # @see SaveData.register
+    def ensure_class(class_name)
+      validate class_name => Symbol
+      @ensured_class = class_name
+    end
+
+    # If present, defines how the value should be fetched from the pre-v19
+    # save format. Requires a block with the old format array as its parameter.
+    # @see SaveData.register
+    def from_old_format(&block)
+      raise ArgumentError, 'No block given to from_old_format' unless block_given?
+      @old_format_get_proc = block
+    end
+
+    # @!endgroup
+
+    # Raises an {InvalidValueError} if the given value is invalid.
+    # @param value [Object] value to check
+    # @raise [InvalidValueError] if the value is invalid
+    def validate_value(value)
+      return if self.valid?(value)
+
+      raise InvalidValueError,
+            "Save value #{@id.inspect} is not a #{@ensured_class} (#{value.class.name} given)"
+    end
+  end
+
+  # Registers a {Value} to be saved into save data.
+  # Takes a block which defines the value's saving ({Value#save_value})
+  # and loading ({Value#load_value}) procedures.
+  #
+  # It is also possible to provide a proc for fetching the value
+  # from the pre-v19 format ({Value#from_old_format}), define
+  # a value to be set upon starting a new game with {Value#new_game_value}
+  # and ensure that the saved and loaded value is of the correct
+  # class with {Value#ensure_class}.
+  #
+  # Values can be registered to be loaded on bootup with
+  # {Value#load_in_bootup}. If a new_game_value proc is defined, it
+  # will be called when the game is launched for the first time,
+  # or if the save data does not contain the value in question.
+  #
+  # @example Registering a new value
+  #   SaveData.register(:foo) do
+  #     ensure_class :Foo
+  #     save_value { $foo }
+  #     load_value { |value| $foo = value }
+  #     new_game_value { Foo.new }
+  #     from_old_format { |old_format| old_format[16] if old_format[16].is_a?(Foo) }
+  #   end
+  # @example Registering a value to be loaded on bootup
+  #   SaveData.register(:bar) do
+  #     load_in_bootup
+  #     save_value { $bar }
+  #     load_value { |value| $bar = value }
+  #     new_game_value { Bar.new }
+  #   end
+  # @param id [Symbol] value id
+  # @yieldself [Value]
+  def self.register(id, &block)
+    validate id => Symbol
+
+    unless block_given?
+      raise ArgumentError, 'No block given to SaveData.register'
+    end
+
+    @values << Value.new(id, &block)
+  end
+
+  # @param save_data [Hash] save data to validate
+  # @return [Boolean] whether the given save data is valid
+  def self.valid?(save_data)
+    validate save_data => Hash
+    return @values.all? { |value| value.valid?(save_data[value.id]) }
+  end
+
+  # @return [Hash{Symbol => Object}] a hash representation of the save data
+  # @raise [InvalidValueError] if an invalid value is being saved
+  def self.compile
+    save_data = {}
+    @values.each { |value| save_data[value.id] = value.save }
+    return save_data
+  end
+
+  # Loads the values from the given save data by
+  # calling each {Value} object's {Value#load_value} proc.
+  # Values that are already loaded are skipped.
+  # If a value does not exist in the save data and has
+  # a {Value#new_game_value} proc defined, that value
+  # is loaded instead.
+  # @param save_data [Hash] save data to load
+  # @raise [InvalidValueError] if an invalid value is being loaded
+  def self.load_all_values(save_data)
+    validate save_data => Hash
+
+    load_values(save_data) { |value| !value.loaded? }
+  end
+
+  # Loads each value from the given save data that has
+  # been set to be loaded during bootup.
+  # @param save_data [Hash] save data to load
+  # @raise [InvalidValueError] if an invalid value is being loaded
+  def self.load_bootup_values(save_data)
+    validate save_data => Hash
+
+    load_values(save_data) { |value| !value.loaded? && value.load_in_bootup? }
+  end
+
+  # Loads values from the given save data.
+  # An optional condition can be passed.
+  # @param save_data [Hash] save data to load from
+  # @param condition_block [Proc] optional condition
+  # @api private
+  def self.load_values(save_data, &condition_block)
+    @values.each do |value|
+      next if block_given? && !condition_block.call(value)
+      if save_data.has_key?(value.id)
+        value.load(save_data[value.id])
+      elsif value.has_new_game_proc?
+        value.load_new_game_value
+      end
+    end
+  end
+
+  # Loads each {Value}'s new game value, if one is defined.
+  def self.load_new_game_values
+    @values.each do |value|
+      value.load_new_game_value if value.has_new_game_proc? && !value.loaded?
+    end
+  end
+
+  # Goes through each value with {Value#load_in_bootup} enabled and
+  # loads their new game value, if one is defined.
+  def self.initialize_bootup_values
+    @values.each do |value|
+      next unless value.load_in_bootup?
+      value.load_new_game_value if value.has_new_game_proc? && !value.loaded?
+    end
+  end
+end
diff --git a/Data/Scripts/007_Events and files/001_Save data/003_BuiltinValues.rb b/Data/Scripts/007_Events and files/001_Save data/003_BuiltinValues.rb
new file mode 100644
index 000000000..cf58818ea
--- /dev/null
+++ b/Data/Scripts/007_Events and files/001_Save data/003_BuiltinValues.rb	
@@ -0,0 +1,129 @@
+# Contains the save values defined in Essentials by default.
+
+SaveData.register(:player) do
+  ensure_class :PlayerTrainer
+  save_value { $Trainer }
+  load_value { |value| $Trainer = value }
+  from_old_format { |old_format| old_format[0] }
+end
+
+SaveData.register(:frame_count) do
+  ensure_class :Integer
+  save_value { Graphics.frame_count }
+  load_value { |value| Graphics.frame_count = value }
+  new_game_value { 0 }
+  from_old_format { |old_format| old_format[1] }
+end
+
+SaveData.register(:game_system) do
+  load_in_bootup
+  ensure_class :Game_System
+  save_value { $game_system }
+  load_value { |value| $game_system = value }
+  new_game_value { Game_System.new }
+  from_old_format { |old_format| old_format[2] }
+end
+
+SaveData.register(:pokemon_system) do
+  load_in_bootup
+  ensure_class :PokemonSystem
+  save_value { $PokemonSystem }
+  load_value { |value| $PokemonSystem = value }
+  new_game_value { PokemonSystem.new }
+  from_old_format { |old_format| old_format[3] }
+end
+
+SaveData.register(:switches) do
+  ensure_class :Game_Switches
+  save_value { $game_switches }
+  load_value { |value| $game_switches = value }
+  new_game_value { Game_Switches.new }
+  from_old_format { |old_format| old_format[5] }
+end
+
+SaveData.register(:variables) do
+  ensure_class :Game_Variables
+  save_value { $game_variables }
+  load_value { |value| $game_variables = value }
+  new_game_value { Game_Variables.new }
+  from_old_format { |old_format| old_format[6] }
+end
+
+SaveData.register(:self_switches) do
+  ensure_class :Game_SelfSwitches
+  save_value { $game_self_switches }
+  load_value { |value| $game_self_switches = value }
+  new_game_value { Game_SelfSwitches.new }
+  from_old_format { |old_format| old_format[7] }
+end
+
+SaveData.register(:game_screen) do
+  ensure_class :Game_Screen
+  save_value { $game_screen }
+  load_value { |value| $game_screen = value }
+  new_game_value { Game_Screen.new }
+  from_old_format { |old_format| old_format[8] }
+end
+
+SaveData.register(:map_factory) do
+  ensure_class :PokemonMapFactory
+  save_value { $MapFactory }
+  load_value { |value| $MapFactory = value }
+  from_old_format { |old_format| old_format[9] }
+end
+
+SaveData.register(:game_player) do
+  ensure_class :Game_Player
+  save_value { $game_player }
+  load_value { |value| $game_player = value }
+  new_game_value { Game_Player.new }
+  from_old_format { |old_format| old_format[10] }
+end
+
+SaveData.register(:global_metadata) do
+  ensure_class :PokemonGlobalMetadata
+  save_value { $PokemonGlobal }
+  load_value { |value| $PokemonGlobal = value }
+  new_game_value { PokemonGlobalMetadata.new }
+  from_old_format { |old_format| old_format[11] }
+end
+
+SaveData.register(:map_metadata) do
+  ensure_class :PokemonMapMetadata
+  save_value { $PokemonMap }
+  load_value { |value| $PokemonMap = value }
+  new_game_value { PokemonMapMetadata.new }
+  from_old_format { |old_format| old_format[12] }
+end
+
+SaveData.register(:bag) do
+  ensure_class :PokemonBag
+  save_value { $PokemonBag }
+  load_value { |value| $PokemonBag = value }
+  from_old_format { |old_format| old_format[13] }
+end
+
+SaveData.register(:storage_system) do
+  ensure_class :PokemonStorage
+  save_value { $PokemonStorage }
+  load_value { |value| $PokemonStorage = value }
+  new_game_value { PokemonStorage.new }
+  from_old_format { |old_format| old_format[14] }
+end
+
+SaveData.register(:essentials_version) do
+  load_in_bootup
+  ensure_class :String
+  save_value { Essentials::VERSION }
+  load_value { |value| $SaveVersion = value }
+  new_game_value { Essentials::VERSION }
+  from_old_format { |old_format| old_format[15] }
+end
+
+SaveData.register(:game_version) do
+  load_in_bootup
+  ensure_class :String
+  save_value { Settings::GAME_VERSION }
+  load_value { |value| $game_version = value }
+  new_game_value { Settings::GAME_VERSION }
+end
diff --git a/Data/Scripts/007_Events and files/001_Save data/004_Conversion.rb b/Data/Scripts/007_Events and files/001_Save data/004_Conversion.rb
new file mode 100644
index 000000000..cf96df00b
--- /dev/null
+++ b/Data/Scripts/007_Events and files/001_Save data/004_Conversion.rb	
@@ -0,0 +1,218 @@
+module SaveData
+  # Contains Conversion objects for each defined conversion:
+  # {
+  #   :essentials => {
+  #     '19'    => [<Conversion>, ...],
+  #     '19.1'  => [<Conversion>, ...],
+  #     ...
+  #   },
+  #   :game => {
+  #     '1.1.0' => [<Conversion>, ...],
+  #     '1.2.0' => [<Conversion>, ...],
+  #     ...
+  #   }
+  # }
+  # Populated during runtime by SaveData.register_conversion calls.
+  @conversions = {
+    essentials: {},
+    game: {}
+  }
+
+  # Represents a conversion made to save data.
+  # New conversions are added using {SaveData.register_conversion}.
+  class Conversion
+    # @return [Symbol] conversion ID
+    attr_reader :id
+    # @return [String] conversion title
+    attr_reader :title
+    # @return [Symbol] trigger type of the conversion (+:essentials+ or +:game+)
+    attr_reader :trigger_type
+    # @return [String] trigger version of the conversion
+    attr_reader :version
+
+    # @param id [String] conversion ID
+    def initialize(id, &block)
+      @id = id
+      @value_procs = {}
+      @all_proc = nil
+      @title = "Running conversion #{@id}"
+      @trigger_type = nil
+      @version = nil
+      instance_eval(&block)
+      if @trigger_type.nil? || @version.nil?
+        raise "Conversion #{@id} is missing a condition"
+      end
+    end
+
+    # Runs the conversion on the given save data.
+    # @param save_data [Hash]
+    def run(save_data)
+      @value_procs.each do |value_id, proc|
+        unless save_data.has_key?(value_id)
+          raise "Save data does not have value #{value_id.inspect}"
+        end
+        proc.call(save_data[value_id])
+      end
+      @all_proc.call(save_data) if @all_proc.is_a?(Proc)
+    end
+
+    # Returns whether the conversion should be run with the given version.
+    # @param version [String] version to check
+    # @return [Boolean] whether the conversion should be run
+    def should_run?(version)
+      return PluginManager.compare_versions(version, @version) < 0
+    end
+
+    private
+
+    # @!group Configuration
+
+    # Sets the conversion's title.
+    # @param new_title [String] conversion title
+    # @note Since conversions are run before loading the player's chosen language,
+    #   conversion titles can not be localized.
+    # @see SaveData.register_conversion
+    def display_title(new_title)
+      validate new_title => String
+      @title = new_title
+    end
+
+    # Sets the conversion to trigger for save files created below
+    # the given Essentials version.
+    # @param version [Numeric, String]
+    # @see SaveData.register_conversion
+    def essentials_version(version)
+      validate version => [Numeric, String]
+
+      raise "Multiple conditions in conversion #{@id}" unless @version.nil?
+
+      @trigger_type = :essentials
+      @version = version.to_s
+    end
+
+    # Sets the conversion to trigger for save files created below
+    # the given game version.
+    # @param version [Numeric, String]
+    # @see SaveData.register_conversion
+    def game_version(version)
+      validate version => [Numeric, String]
+
+      raise "Multiple conditions in conversion #{@id}" unless @version.nil?
+
+      @trigger_type = :game
+      @version = version.to_s
+    end
+
+    # Defines a conversion to the given save value.
+    # @param value_id [Symbol] save value ID
+    # @see SaveData.register_conversion
+    def to_value(value_id, &block)
+      validate value_id => Symbol
+
+      raise ArgumentError, 'No block given to to_value' unless block_given?
+
+      if @value_procs[value_id].is_a?(Proc)
+        raise "Multiple to_value definitions in conversion #{@id} for #{value_id}"
+      end
+
+      @value_procs[value_id] = block
+    end
+
+    # Defines a conversion to the entire save data.
+    # @see SaveData.register_conversion
+    def to_all(&block)
+      raise ArgumentError, 'No block given to to_all' unless block_given?
+
+      if @all_proc.is_a?(Proc)
+        raise "Multiple to_all definitions in conversion #{@id}"
+      end
+
+      @all_proc = block
+    end
+
+    # @!endgroup
+  end
+
+  # Registers a {Conversion} to occur for save data that meets the given criteria.
+  # Two types of criteria can be defined: {Conversion#essentials_version} and
+  # {Conversion#game_version}. The conversion is automatically run on save data
+  # that contains an older version number.
+  #
+  # A single value can be modified with {Conversion#to_value}. The entire save data
+  # is accessed with {Conversion#to_all}, and a conversion title can be specified
+  # with {Conversion#display_title}.
+  # @example Registering a new conversion
+  #   SaveData.register_conversion(:my_conversion) do
+  #     game_version '1.1.0'
+  #     display_title 'Converting some stuff'
+  #     to_value :player do |player|
+  #       # code that modifies the :player value
+  #     end
+  #     to_all do |save_data|
+  #       save_data[:new_value] = Foo.new
+  #     end
+  #   end
+  # @yieldself [Conversion]
+  def self.register_conversion(id, &block)
+    validate id => Symbol
+
+    unless block_given?
+      raise ArgumentError, 'No block given to SaveData.register_conversion'
+    end
+
+    conversion = Conversion.new(id, &block)
+
+    @conversions[conversion.trigger_type][conversion.version] ||= []
+    @conversions[conversion.trigger_type][conversion.version] << conversion
+  end
+
+  # Runs all possible conversions on the given save data.
+  # Saves a backup before running conversions.
+  # @param save_data [Hash] save data to run conversions on
+  # @return [Boolean] whether conversions were run
+  def self.run_conversions(save_data)
+    validate save_data => Hash
+    conversions_to_run = self.get_conversions(save_data)
+
+    return false if conversions_to_run.none?
+
+    File.open(SaveData::FILE_PATH + '.bak', 'wb') { |f| Marshal.dump(save_data, f) }
+
+    echoln "Running #{conversions_to_run.length} conversions..."
+
+    conversions_to_run.each do |conversion|
+      echo "#{conversion.title}..."
+      conversion.run(save_data)
+      echoln ' done.'
+    end
+
+    return true
+  end
+
+  # @param save_data [Hash] save data to get conversions for
+  # @return [Array<Conversion>] all conversions that should be run on the data
+  def self.get_conversions(save_data)
+    conversions_to_run = []
+
+    versions = {
+      essentials: save_data[:essentials_version] || '18.1',
+      game: save_data[:game_version] || '0.0.0'
+    }
+
+    [:essentials, :game].each do |trigger_type|
+      # Ensure the versions are sorted from lowest to highest
+      sorted_versions = @conversions[trigger_type].keys.sort do |v1, v2|
+        PluginManager.compare_versions(v1, v2)
+      end
+
+      sorted_versions.each do |version|
+        @conversions[trigger_type][version].each do |conversion|
+          next unless conversion.should_run?(versions[trigger_type])
+          conversions_to_run << conversion
+        end
+      end
+    end
+
+    return conversions_to_run
+  end
+end
diff --git a/Data/Scripts/007_Events and files/001_Save data/005_BuiltinConversions.rb b/Data/Scripts/007_Events and files/001_Save data/005_BuiltinConversions.rb
new file mode 100644
index 000000000..3be75f7d5
--- /dev/null
+++ b/Data/Scripts/007_Events and files/001_Save data/005_BuiltinConversions.rb	
@@ -0,0 +1,48 @@
+# Contains conversions defined in Essentials by default.
+
+SaveData.register_conversion(:v19_define_versions) do
+  essentials_version 19
+  display_title 'Defining versions in save data'
+  to_all do |save_data|
+    unless save_data.has_key?(:essentials_version)
+      save_data[:essentials_version] = Essentials::VERSION
+    end
+    unless save_data.has_key?(:game_version)
+      save_data[:game_version] = Settings::GAME_VERSION
+    end
+  end
+end
+
+SaveData.register_conversion(:v19_convert_player) do
+  essentials_version 19
+  display_title 'Converting player trainer'
+  to_all do |save_data|
+    next if save_data[:player].is_a?(PlayerTrainer)
+    # Conversion of the party is handled in PokeBattle_Trainer.copy
+    save_data[:player] = PokeBattle_Trainer.copy(save_data[:player])
+  end
+end
+
+SaveData.register_conversion(:v19_convert_storage) do
+  essentials_version 19
+  display_title 'Converting Pokémon in storage'
+  to_value :storage_system do |storage|
+    storage.instance_eval do
+      for box in 0...self.maxBoxes
+        for i in 0...self.maxPokemon(box)
+          next unless self[box, i]
+          next if self[box, i].is_a?(Pokemon)
+          self[box, i] = PokeBattle_Pokemon.copy(self[box, i])
+        end
+      end
+    end # storage.instance_eval
+  end # to_value
+end
+
+SaveData.register_conversion(:v19_convert_global_metadata) do
+  essentials_version 19
+  display_title 'Converting global metadata'
+  to_value :global_metadata do |global|
+    global.encounter_version ||= 0
+  end
+end
diff --git a/Data/Scripts/014_Trainers/001b_Trainer_deprecated.rb b/Data/Scripts/014_Trainers/001b_Trainer_deprecated.rb
index b3e8e1810..b33ad800d 100644
--- a/Data/Scripts/014_Trainers/001b_Trainer_deprecated.rb
+++ b/Data/Scripts/014_Trainers/001b_Trainer_deprecated.rb
@@ -51,7 +51,7 @@ class PokeBattle_Trainer
     ret.character_ID          = trainer.metaID if trainer.metaID
     ret.outfit                = trainer.outfit if trainer.outfit
     ret.language              = trainer.language if trainer.language
-    trainer.party.each { |p| ret.party.push(Pokemon.copy(p)) }
+    trainer.party.each { |p| ret.party.push(PokeBattle_Pokemon.copy(p)) }
     ret.badges                = trainer.badges.clone
     ret.money                 = trainer.money
     trainer.seen.each_with_index { |value, i| ret.set_seen(i) if value }
diff --git a/Data/Scripts/016_Pokemon/010_Pokemon_Deprecated.rb b/Data/Scripts/016_Pokemon/010_Pokemon_Deprecated.rb
index d5b383bf7..425292aed 100644
--- a/Data/Scripts/016_Pokemon/010_Pokemon_Deprecated.rb
+++ b/Data/Scripts/016_Pokemon/010_Pokemon_Deprecated.rb
@@ -20,13 +20,15 @@ class PokeBattle_Pokemon
   attr_reader :trainerID, :ot, :otgender, :language
   attr_reader :shadow, :heartgauge, :savedexp, :savedev, :hypermode, :shadowmoves
 
-  def initialise
+  def initialize(*args)
     raise "PokeBattle_Pokemon.new is deprecated. Use Pokemon.new instead."
   end
 
   def self.copy(pkmn)
+    return pkmn if pkmn.is_a?(Pokemon)
     owner = Pokemon::Owner.new(pkmn.trainerID, pkmn.ot, pkmn.otgender, pkmn.language)
-    ret = Pokemon.new(pkmn.species, pkmn.level, owner, false)
+    # Set level to 1 initially, as it will be recalculated later
+    ret = Pokemon.new(pkmn.species, 1, owner, false)
     ret.forced_form      = pkmn.forcedForm if pkmn.forcedForm
     ret.time_form_set    = pkmn.formTime
     ret.exp              = pkmn.exp
diff --git a/Data/Scripts/017_UI/013_PScreen_Load.rb b/Data/Scripts/017_UI/013_PScreen_Load.rb
index 3035d77c8..a1121ab4d 100644
--- a/Data/Scripts/017_UI/013_PScreen_Load.rb
+++ b/Data/Scripts/017_UI/013_PScreen_Load.rb
@@ -98,20 +98,20 @@ end
 #
 #===============================================================================
 class PokemonLoad_Scene
-  def pbStartScene(commands,showContinue,trainer,framecount,mapid)
+  def pbStartScene(commands, show_continue, trainer, frame_count, map_id)
     @commands = commands
     @sprites = {}
-    @viewport = Viewport.new(0,0,Graphics.width,Graphics.height)
+    @viewport = Viewport.new(0, 0, Graphics.width, Graphics.height)
     @viewport.z = 99998
     addBackgroundOrColoredPlane(@sprites,"background","loadbg",Color.new(248,248,248),@viewport)
     y = 16*2
     for i in 0...commands.length
       @sprites["panel#{i}"] = PokemonLoadPanel.new(i,commands[i],
-         (showContinue) ? (i==0) : false,trainer,framecount,mapid,@viewport)
+         (show_continue) ? (i==0) : false,trainer,frame_count,map_id,@viewport)
       @sprites["panel#{i}"].x = 24*2
       @sprites["panel#{i}"].y = y
       @sprites["panel#{i}"].pbRefresh
-      y += (showContinue && i==0) ? 112*2 : 24*2
+      y += (show_continue && i==0) ? 112*2 : 24*2
     end
     @sprites["cmdwindow"] = Window_CommandPokemon.new([])
     @sprites["cmdwindow"].viewport = @viewport
@@ -212,41 +212,52 @@ end
 class PokemonLoadScreen
   def initialize(scene)
     @scene = scene
+    if SaveData.exists?
+      @save_data = load_save_file(SaveData::FILE_PATH)
+    else
+      @save_data = {}
+    end
   end
 
-  def pbTryLoadFile(savefile)
-    trainer       = nil
-    framecount    = nil
-    game_system   = nil
-    pokemonSystem = nil
-    mapid         = nil
-    File.open(savefile) { |f|
-      trainer       = Marshal.load(f)
-      framecount    = Marshal.load(f)
-      game_system   = Marshal.load(f)
-      pokemonSystem = Marshal.load(f)
-      mapid         = Marshal.load(f)
-    }
-    raise "Corrupted file" if !trainer.is_a?(PlayerTrainer)
-    raise "Corrupted file" if !framecount.is_a?(Numeric)
-    raise "Corrupted file" if !game_system.is_a?(Game_System)
-    raise "Corrupted file" if !pokemonSystem.is_a?(PokemonSystem)
-    raise "Corrupted file" if !mapid.is_a?(Numeric)
-    return [trainer,framecount,game_system,pokemonSystem,mapid]
+  # @param file_path [String] file to load save data from
+  # @return [Hash] save data
+  def load_save_file(file_path)
+    save_data = SaveData.read_from_file(file_path)
+
+    unless SaveData.valid?(save_data)
+      if File.file?(file_path + '.bak')
+        pbMessage(_INTL('The save file is corrupt. A backup will be loaded.'))
+        save_data = load_save_file(file_path + '.bak')
+      else
+        self.prompt_save_deletion
+        return {}
+      end
+    end
+
+    return save_data
+  end
+
+  # Called if all save data is invalid.
+  # Prompts the player to delete the save files.
+  def prompt_save_deletion
+    pbMessage(_INTL('The save file is corrupt, or is incompatible with this game.'))
+    exit unless pbConfirmMessageSerious(
+      _INTL('Do you want to delete the save file and start anew?')
+    )
+    self.delete_save_data
+    $game_system   = Game_System.new
+    $PokemonSystem = PokemonSystem.new
   end
 
   def pbStartDeleteScreen
-    savefile = RTP.getSaveFileName("Game.rxdata")
     @scene.pbStartDeleteScene
     @scene.pbStartScene2
-    if safeExists?(savefile)
+    if SaveData.exists?
       if pbConfirmMessageSerious(_INTL("Delete all saved data?"))
         pbMessage(_INTL("Once data has been deleted, there is no way to recover it.\1"))
         if pbConfirmMessageSerious(_INTL("Delete the saved data anyway?"))
           pbMessage(_INTL("Deleting all data. Don't turn off the power.\\wtnp[0]"))
-          begin; File.delete(savefile); rescue; end
-          begin; File.delete(savefile+".bak"); rescue; end
-          pbMessage(_INTL("The save file was deleted."))
+          self.delete_save_data
         end
       end
     else
@@ -256,226 +267,82 @@ class PokemonLoadScreen
     $scene = pbCallTitle
   end
 
+  def delete_save_data
+    begin
+      SaveData.delete_file
+      pbMessage(_INTL('The saved data was deleted.'))
+    rescue SystemCallError
+      pbMessage(_INTL('All saved data could not be deleted.'))
+    end
+  end
+
   def pbStartLoadScreen
-    $PokemonTemp   = PokemonTemp.new
-    $game_temp     = Game_Temp.new
-    $game_system   = Game_System.new
-    $PokemonSystem = PokemonSystem.new if !$PokemonSystem
-    savefile = RTP.getSaveFileName("Game.rxdata")
-    mapfile = sprintf("Data/Map%03d.rxdata", $data_system.start_map_id)
-    if $data_system.start_map_id == 0 || !pbRgssExists?(mapfile)
-      pbMessage(_INTL("No starting position was set in the map editor.\1"))
-      pbMessage(_INTL("The game cannot continue."))
-      @scene.pbEndScene
-      $scene = nil
-      return
-    end
     commands = []
-    cmdContinue    = -1
-    cmdNewGame     = -1
-    cmdOption      = -1
-    cmdLanguage    = -1
-    cmdMysteryGift = -1
-    cmdDebug       = -1
-    cmdQuit        = -1
-    if safeExists?(savefile)
-      trainer      = nil
-      framecount   = 0
-      mapid        = 0
-      haveBackup   = false
-      showContinue = false
-      begin
-        trainer, framecount, $game_system, $PokemonSystem, mapid = pbTryLoadFile(savefile)
-        showContinue = true
-      rescue
-        if safeExists?(savefile+".bak")
-          begin
-            trainer, framecount, $game_system, $PokemonSystem, mapid = pbTryLoadFile(savefile+".bak")
-            haveBackup   = true
-            showContinue = true
-          rescue
-          end
-        end
-        if haveBackup
-          pbMessage(_INTL("The save file is corrupt. The previous save file will be loaded."))
-        else
-          pbMessage(_INTL("The save file is corrupt, or is incompatible with this game."))
-          if !pbConfirmMessageSerious(_INTL("Do you want to delete the save file and start anew?"))
-            $scene = nil
-            return
-          end
-          begin; File.delete(savefile); rescue; end
-          begin; File.delete(savefile+".bak"); rescue; end
-          $game_system   = Game_System.new
-          $PokemonSystem = PokemonSystem.new if !$PokemonSystem
-          pbMessage(_INTL("The save file was deleted."))
-        end
+    cmd_continue     = -1
+    cmd_new_game     = -1
+    cmd_options      = -1
+    cmd_language     = -1
+    cmd_mystery_gift = -1
+    cmd_debug        = -1
+    cmd_quit         = -1
+    show_continue = !@save_data.empty?
+    if show_continue
+      commands[cmd_continue = commands.length] = _INTL('Continue')
+      if @save_data[:player].mystery_gift_unlocked
+        commands[cmd_mystery_gift = commands.length] = _INTL('Mystery Gift')
       end
-      if showContinue
-        if !haveBackup
-          begin; File.delete(savefile+".bak"); rescue; end
-        end
-      end
-      commands[cmdContinue = commands.length]    = _INTL("Continue") if showContinue
-      commands[cmdNewGame = commands.length]     = _INTL("New Game")
-      commands[cmdMysteryGift = commands.length] = _INTL("Mystery Gift") if trainer.mystery_gift_unlocked
-    else
-      commands[cmdNewGame = commands.length]     = _INTL("New Game")
     end
-    commands[cmdOption = commands.length]        = _INTL("Options")
-    commands[cmdLanguage = commands.length]      = _INTL("Language") if Settings::LANGUAGES.length>=2
-    commands[cmdDebug = commands.length]         = _INTL("Debug") if $DEBUG
-    commands[cmdQuit = commands.length]          = _INTL("Quit Game")
-    @scene.pbStartScene(commands,showContinue,trainer,framecount,mapid)
-    @scene.pbSetParty(trainer) if showContinue
+    commands[cmd_new_game = commands.length]  = _INTL('New Game')
+    commands[cmd_options = commands.length]   = _INTL('Options')
+    commands[cmd_language = commands.length]  = _INTL('Language') if Settings::LANGUAGES.length >= 2
+    commands[cmd_debug = commands.length]     = _INTL('Debug') if $DEBUG
+    commands[cmd_quit = commands.length]      = _INTL('Quit Game')
+    map_id = show_continue ? @save_data[:map_factory].map.map_id : 0
+    @scene.pbStartScene(commands, show_continue, @save_data[:player],
+                        @save_data[:frame_count] || 0, map_id)
+    @scene.pbSetParty(@save_data[:player]) if show_continue
     @scene.pbStartScene2
-    pbLoadBattleAnimations
     loop do
       command = @scene.pbChoose(commands)
-      if cmdContinue>=0 && command==cmdContinue
-        unless safeExists?(savefile)
-          pbPlayBuzzerSE
-          next
-        end
-        pbPlayDecisionSE
+      pbPlayDecisionSE if command != cmd_quit
+      case command
+      when cmd_continue
         @scene.pbEndScene
-        metadata = nil
-        File.open(savefile) { |f|
-          Marshal.load(f)   # Trainer already loaded
-          $Trainer             = trainer
-          Graphics.frame_count = Marshal.load(f)
-          $game_system         = Marshal.load(f)
-          Marshal.load(f)   # PokemonSystem already loaded
-          Marshal.load(f)   # Current map id no longer needed
-          $game_switches       = Marshal.load(f)
-          $game_variables      = Marshal.load(f)
-          $game_self_switches  = Marshal.load(f)
-          $game_screen         = Marshal.load(f)
-          $MapFactory          = Marshal.load(f)
-          $game_map            = $MapFactory.map
-          $game_player         = Marshal.load(f)
-          $PokemonGlobal       = Marshal.load(f)
-          metadata             = Marshal.load(f)
-          $PokemonBag          = Marshal.load(f)
-          $PokemonStorage      = Marshal.load(f)
-          $SaveVersion         = Marshal.load(f) unless f.eof?
-          magicNumberMatches = false
-          if $data_system.respond_to?("magic_number")
-            magicNumberMatches = ($game_system.magic_number==$data_system.magic_number)
-          else
-            magicNumberMatches = ($game_system.magic_number==$data_system.version_id)
-          end
-          if !magicNumberMatches || $PokemonGlobal.safesave
-            if pbMapInterpreterRunning?
-              pbMapInterpreter.setup(nil,0)
-            end
-            begin
-              $MapFactory.setup($game_map.map_id)   # calls setMapChanged
-            rescue Errno::ENOENT
-              if $DEBUG
-                pbMessage(_INTL("Map {1} was not found.",$game_map.map_id))
-                map = pbWarpToMap
-                if map
-                  $MapFactory.setup(map[0])
-                  $game_player.moveto(map[1],map[2])
-                else
-                  $game_map = nil
-                  $scene = nil
-                  return
-                end
-              else
-                $game_map = nil
-                $scene = nil
-                pbMessage(_INTL("The map was not found. The game cannot continue."))
-              end
-            end
-            $game_player.center($game_player.x, $game_player.y)
-          else
-            $MapFactory.setMapChanged($game_map.map_id)
-          end
-        }
-        if !$game_map.events   # Map wasn't set up
-          $game_map = nil
-          $scene = nil
-          pbMessage(_INTL("The map is corrupt. The game cannot continue."))
-          return
-        end
-        $PokemonMap = metadata
-        $PokemonEncounters = PokemonEncounters.new
-        $PokemonEncounters.setup($game_map.map_id)
-        pbAutoplayOnSave
-        $game_map.update
-        $PokemonMap.updateMap
-        $scene = Scene_Map.new
+        Game.load(@save_data)
         return
-      elsif cmdNewGame>=0 && command==cmdNewGame
-        pbPlayDecisionSE
+      when cmd_new_game
         @scene.pbEndScene
-        if $game_map && $game_map.events
-          for event in $game_map.events.values
-            event.clear_starting
-          end
-        end
-        $game_temp.common_event_id = 0 if $game_temp
-        $scene               = Scene_Map.new
-        Graphics.frame_count = 0
-        $game_system         = Game_System.new
-        $game_switches       = Game_Switches.new
-        $game_variables      = Game_Variables.new
-        $game_self_switches  = Game_SelfSwitches.new
-        $game_screen         = Game_Screen.new
-        $game_player         = Game_Player.new
-        $PokemonMap          = PokemonMapMetadata.new
-        $PokemonGlobal       = PokemonGlobalMetadata.new
-        $PokemonStorage      = PokemonStorage.new
-        $PokemonEncounters   = PokemonEncounters.new
-        $PokemonTemp.begunNewGame = true
-        $MapFactory          = PokemonMapFactory.new($data_system.start_map_id)   # calls setMapChanged
-        $game_player.moveto($data_system.start_x, $data_system.start_y)
-        $game_player.refresh
-        $game_map.autoplay
-        $game_map.update
+        Game.start_new
         return
-      elsif cmdMysteryGift>=0 && command==cmdMysteryGift
-        pbPlayDecisionSE
-        pbFadeOutIn {
-          trainer = pbDownloadMysteryGift(trainer)
-        }
-      elsif cmdOption>=0 && command==cmdOption
-        pbPlayDecisionSE
-        pbFadeOutIn {
+      when cmd_mystery_gift
+        pbFadeOutIn do
+          @save_data[:player] = pbDownloadMysteryGift(@save_data[:player])
+        end
+      when cmd_options
+        pbFadeOutIn do
           scene = PokemonOption_Scene.new
           screen = PokemonOptionScreen.new(scene)
           screen.pbStartScreen(true)
-        }
-      elsif cmdLanguage>=0 && command==cmdLanguage
-        pbPlayDecisionSE
+        end
+      when cmd_language
         @scene.pbEndScene
         $PokemonSystem.language = pbChooseLanguage
-        pbLoadMessages("Data/"+Settings::LANGUAGES[$PokemonSystem.language][1])
-        savedata = []
-        if safeExists?(savefile)
-          File.open(savefile,"rb") { |f|
-            16.times { savedata.push(Marshal.load(f)) }
-          }
-          savedata[3]=$PokemonSystem
-          begin
-            File.open(RTP.getSaveFileName("Game.rxdata"),"wb") { |f|
-              16.times { |i| Marshal.dump(savedata[i],f) }
-            }
-          rescue
-          end
+        pbLoadMessages('Data/' + Settings::LANGUAGES[$PokemonSystem.language][1])
+        if show_continue
+          @save_data[:pokemon_system] = $PokemonSystem
+          File.open(SaveData::FILE_PATH, 'wb') { |file| Marshal.dump(@save_data, file) }
         end
         $scene = pbCallTitle
         return
-      elsif cmdDebug>=0 && command==cmdDebug
-        pbPlayDecisionSE
+      when cmd_debug
         pbFadeOutIn { pbDebugMenu(false) }
-      elsif cmdQuit>=0 && command==cmdQuit
+      when cmd_quit
         pbPlayCloseMenuSE
         @scene.pbEndScene
         $scene = nil
         return
+      else
+        pbPlayBuzzerSE
       end
     end
   end
diff --git a/Data/Scripts/017_UI/014_PScreen_Save.rb b/Data/Scripts/017_UI/014_PScreen_Save.rb
index bf5727ccc..1642efd1d 100644
--- a/Data/Scripts/017_UI/014_PScreen_Save.rb
+++ b/Data/Scripts/017_UI/014_PScreen_Save.rb
@@ -1,60 +1,29 @@
-#===============================================================================
-#
-#===============================================================================
-def pbSave(safesave=false)
-  begin
-    File.open(RTP.getSaveFileName("Game.rxdata"),"wb") { |f|
-       Marshal.dump($Trainer,f)
-       Marshal.dump(Graphics.frame_count,f)
-       if $data_system.respond_to?("magic_number")
-         $game_system.magic_number = $data_system.magic_number
-       else
-         $game_system.magic_number = $data_system.version_id
-       end
-       $game_system.save_count+=1
-       Marshal.dump($game_system,f)
-       Marshal.dump($PokemonSystem,f)
-       Marshal.dump($game_map.map_id,f)
-       Marshal.dump($game_switches,f)
-       Marshal.dump($game_variables,f)
-       Marshal.dump($game_self_switches,f)
-       Marshal.dump($game_screen,f)
-       Marshal.dump($MapFactory,f)
-       Marshal.dump($game_player,f)
-       $PokemonGlobal.safesave=safesave
-       Marshal.dump($PokemonGlobal,f)
-       Marshal.dump($PokemonMap,f)
-       Marshal.dump($PokemonBag,f)
-       Marshal.dump($PokemonStorage,f)
-       Marshal.dump(Essentials::VERSION, f)
-    }
-    Graphics.frame_reset
-  rescue
-    return false
-  end
-  return true
+# @deprecated Use {Game.save} instead. pbSave is slated to be removed in v20.
+def pbSave(safesave = false)
+  Deprecation.warn_method('pbSave', 'Game.save', 'v20')
+  Game.save(safe: safesave)
 end
 
 def pbEmergencySave
-  oldscene=$scene
-  $scene=nil
+  oldscene = $scene
+  $scene = nil
   pbMessage(_INTL("The script is taking too long. The game will restart."))
   return if !$Trainer
-  if safeExists?(RTP.getSaveFileName("Game.rxdata"))
-    File.open(RTP.getSaveFileName("Game.rxdata"),  'rb') { |r|
-      File.open(RTP.getSaveFileName("Game.rxdata.bak"), 'wb') { |w|
+  if SaveData.exists?
+    File.open(SaveData::FILE_PATH, 'rb') do |r|
+      File.open(SaveData::FILE_PATH + '.bak', 'wb') do |w|
         while s = r.read(4096)
           w.write s
         end
-      }
-    }
+      end
+    end
   end
-  if pbSave
+  if Game.save
     pbMessage(_INTL("\\se[]The game was saved.\\me[GUI save game] The previous save file has been backed up.\\wtnp[30]"))
   else
     pbMessage(_INTL("\\se[]Save failed.\\wtnp[30]"))
   end
-  $scene=oldscene
+  $scene = oldscene
 end
 
 #===============================================================================
@@ -117,33 +86,31 @@ class PokemonSaveScreen
   end
 
   def pbSaveScreen
-    ret=false
+    ret = false
     @scene.pbStartScreen
-    if pbConfirmMessage(_INTL("Would you like to save the game?"))
-      if safeExists?(RTP.getSaveFileName("Game.rxdata"))
-        if $PokemonTemp.begunNewGame
-          pbMessage(_INTL("WARNING!"))
-          pbMessage(_INTL("There is a different game file that is already saved."))
-          pbMessage(_INTL("If you save now, the other file's adventure, including items and Pokémon, will be entirely lost."))
-          if !pbConfirmMessageSerious(
-             _INTL("Are you sure you want to save now and overwrite the other save file?"))
-            pbSEPlay("GUI save choice")
-            @scene.pbEndScreen
-            return false
-          end
+    if pbConfirmMessage(_INTL('Would you like to save the game?'))
+      if SaveData.exists? && $PokemonTemp.begunNewGame
+        pbMessage(_INTL('WARNING!'))
+        pbMessage(_INTL('There is a different game file that is already saved.'))
+        pbMessage(_INTL("If you save now, the other file's adventure, including items and Pokémon, will be entirely lost."))
+        if !pbConfirmMessageSerious(
+            _INTL('Are you sure you want to save now and overwrite the other save file?'))
+          pbSEPlay('GUI save choice')
+          @scene.pbEndScreen
+          return false
         end
       end
-      $PokemonTemp.begunNewGame=false
-      pbSEPlay("GUI save choice")
-      if pbSave
-        pbMessage(_INTL("\\se[]{1} saved the game.\\me[GUI save game]\\wtnp[30]",$Trainer.name))
-        ret=true
+      $PokemonTemp.begunNewGame = false
+      pbSEPlay('GUI save choice')
+      if Game.save
+        pbMessage(_INTL("\\se[]{1} saved the game.\\me[GUI save game]\\wtnp[30]", $Trainer.name))
+        ret = true
       else
         pbMessage(_INTL("\\se[]Save failed.\\wtnp[30]"))
-        ret=false
+        ret = false
       end
     else
-      pbSEPlay("GUI save choice")
+      pbSEPlay('GUI save choice')
     end
     @scene.pbEndScreen
     return ret
diff --git a/Data/Scripts/019_Other battles/003_PBattle_OrgBattle.rb b/Data/Scripts/019_Other battles/003_PBattle_OrgBattle.rb
index 580478fe5..8adf6dd5c 100644
--- a/Data/Scripts/019_Other battles/003_PBattle_OrgBattle.rb	
+++ b/Data/Scripts/019_Other battles/003_PBattle_OrgBattle.rb	
@@ -355,7 +355,7 @@ class BattleChallengeData
     @start=[$game_map.map_id,$game_player.x,$game_player.y]
     @oldParty=$Trainer.party
     $Trainer.party=@party if @party
-    pbSave(true)
+    Game.save(safe: true)
   end
 
   def pbCancel
@@ -369,9 +369,7 @@ class BattleChallengeData
     save=(@decision!=0)
     reset
     $game_map.need_refresh=true
-    if save
-      pbSave(true)
-    end
+    Game.save(safe: true) if save
   end
 
   def pbGoOn
@@ -410,7 +408,7 @@ class BattleChallengeData
     $game_map.map_id=@start[0]
     $game_player.moveto2(@start[1],@start[2])
     $game_player.direction=8 # facing up
-    pbSave(true)
+    Game.save(safe: true)
     $game_map.map_id=oldmapid
     $game_player.moveto2(oldx,oldy)
     $game_player.direction=olddirection
diff --git a/Data/Scripts/020_System and utilities/002_PSystem_System.rb b/Data/Scripts/020_System and utilities/002_PSystem_System.rb
index d81679421..0ea15d38e 100644
--- a/Data/Scripts/020_System and utilities/002_PSystem_System.rb	
+++ b/Data/Scripts/020_System and utilities/002_PSystem_System.rb	
@@ -16,44 +16,6 @@ def pbChooseLanguage
   return pbShowCommands(nil,commands)
 end
 
-
-def pbSetUpSystem
-  begin
-    trainer       = nil
-    framecount    = 0
-    game_system   = nil
-    pokemonSystem = nil
-    havedata = false
-    File.open(RTP.getSaveFileName("Game.rxdata")) { |f|
-      trainer       = Marshal.load(f)
-      framecount    = Marshal.load(f)
-      game_system   = Marshal.load(f)
-      pokemonSystem = Marshal.load(f)
-    }
-    raise "Corrupted file" if !trainer.is_a?(PlayerTrainer)
-    raise "Corrupted file" if !framecount.is_a?(Numeric)
-    raise "Corrupted file" if !game_system.is_a?(Game_System)
-    raise "Corrupted file" if !pokemonSystem.is_a?(PokemonSystem)
-    havedata = true
-  rescue
-    game_system   = Game_System.new
-    pokemonSystem = PokemonSystem.new
-  end
-  if $INEDITOR
-    pbSetResizeFactor(1.0)
-  else
-    $game_system   = game_system
-    $PokemonSystem = pokemonSystem
-    pbSetResizeFactor([$PokemonSystem.screensize, 4].min)
-  end
-  # Load constants
-  GameData.load_all
-  if Settings::LANGUAGES.length>=2
-    pokemonSystem.language = pbChooseLanguage if !havedata
-    pbLoadMessages("Data/"+Settings::LANGUAGES[pokemonSystem.language][1])
-  end
-end
-
 def pbScreenCapture
   t = pbGetTimeNow
   filestart = t.strftime("[%Y-%m-%d] %H_%M_%S")
diff --git a/Data/Scripts/020_System and utilities/006_Game.rb b/Data/Scripts/020_System and utilities/006_Game.rb
new file mode 100644
index 000000000..8e164b8ae
--- /dev/null
+++ b/Data/Scripts/020_System and utilities/006_Game.rb	
@@ -0,0 +1,136 @@
+# The Game module contains methods for saving and loading the game.
+module Game
+  # Initializes various global variables and loads the game data.
+  def self.initialize
+    $PokemonTemp        = PokemonTemp.new
+    $game_temp          = Game_Temp.new
+    $game_system        = Game_System.new
+    $data_animations    = load_data('Data/Animations.rxdata')
+    $data_tilesets      = load_data('Data/Tilesets.rxdata')
+    $data_common_events = load_data('Data/CommonEvents.rxdata')
+    $data_system        = load_data('Data/System.rxdata')
+    pbLoadBattleAnimations
+    GameData.load_all
+
+    map_file = format('Data/Map%03d.rxdata', $data_system.start_map_id)
+
+    if $data_system.start_map_id == 0 || !pbRgssExists?(map_file)
+      raise _INTL('No starting position was set in the map editor.')
+    end
+  end
+
+  # Loads values from the save file and runs any necessary
+  # conversions on it.
+  def self.set_up_system
+    SaveData.move_old_windows_save if System.platform[/Windows/]
+
+    if SaveData.exists?
+      save_data = SaveData.read_from_file(SaveData::FILE_PATH)
+    else
+      save_data = {}
+    end
+
+    if !save_data.empty? && SaveData.run_conversions(save_data)
+      File.open(SaveData::FILE_PATH, 'wb') { |f| Marshal.dump(save_data, f) }
+    end
+
+    if save_data.empty?
+      SaveData.initialize_bootup_values
+    else
+      SaveData.load_bootup_values(save_data)
+    end
+
+    pbSetResizeFactor([$PokemonSystem.screensize, 4].min)
+    if Settings::LANGUAGES.length >= 2
+      $PokemonSystem.language = pbChooseLanguage if save_data.empty?
+      pbLoadMessages('Data/' + Settings::LANGUAGES[$PokemonSystem.language][1])
+    end
+  end
+
+  # Saves the game. Returns whether the operation was successful.
+  # @param save_file [String] the save file path
+  # @param safe [Boolean] whether $PokemonGlobal.safesave should be set to true
+  # @return [Boolean] whether the operation was successful
+  # @raise [SaveData::InvalidValueError] if an invalid value is being saved
+  def self.save(save_file = SaveData::FILE_PATH, safe: false)
+    validate save_file => String, safe => [TrueClass, FalseClass]
+
+    $PokemonGlobal.safesave = safe
+    $game_system.save_count += 1
+    $game_system.magic_number = $data_system.magic_number
+    begin
+      SaveData.save_to_file(save_file)
+      Graphics.frame_reset
+    rescue IOError, SystemCallError
+      $game_system.save_count -= 1
+      return false
+    end
+
+    return true
+  end
+
+  # Loads the game from the given save data and starts the map scene.
+  # @param save_data [Hash] hash containing the save data
+  # @raise [SaveData::InvalidValueError] if an invalid value is being loaded
+  def self.load(save_data)
+    validate save_data => Hash
+
+    SaveData.load_all_values(save_data)
+
+    self.load_map
+
+    pbAutoplayOnSave
+    $game_map.update
+    $PokemonMap.updateMap
+    $scene = Scene_Map.new
+  end
+
+  # Loads and validates the map. Called when loading a saved game.
+  def self.load_map
+    $game_map = $MapFactory.map
+    magic_number_matches = ($game_system.magic_number == $data_system.magic_number)
+    if !magic_number_matches || $PokemonGlobal.safesave
+      if pbMapInterpreterRunning?
+        pbMapInterpreter.setup(nil, 0)
+      end
+      begin
+        $MapFactory.setup($game_map.map_id)
+      rescue Errno::ENOENT
+        if $DEBUG
+          pbMessage(_INTL('Map {1} was not found.', $game_map.map_id))
+          map = pbWarpToMap
+          exit unless map
+          $MapFactory.setup(map[0])
+          $game_player.moveto(map[1], map[2])
+        else
+          raise _INTL('The map was not found. The game cannot continue.')
+        end
+      end
+      $game_player.center($game_player.x, $game_player.y)
+    else
+      $MapFactory.setMapChanged($game_map.map_id)
+    end
+    if $game_map.events.nil?
+      raise _INTL('The map is corrupt. The game cannot continue.')
+    end
+    $PokemonEncounters = PokemonEncounters.new
+    $PokemonEncounters.setup($game_map.map_id)
+  end
+
+  # Called when starting a new game. Initializes global variables
+  # and transfers the player into the map scene.
+  def self.start_new
+    if $game_map && $game_map.events
+      $game_map.events.each_value { |event| event.clear_starting }
+    end
+    $game_temp.common_event_id = 0 if $game_temp
+    $PokemonTemp.begunNewGame = true
+    $scene = Scene_Map.new
+    SaveData.load_new_game_values
+    $MapFactory = PokemonMapFactory.new($data_system.start_map_id)
+    $game_player.moveto($data_system.start_x, $data_system.start_y)
+    $game_player.refresh
+    $game_map.autoplay
+    $game_map.update
+  end
+end
diff --git a/Data/Scripts/999_Main/999_Main.rb b/Data/Scripts/999_Main/999_Main.rb
index edd9b5ef6..5d01980d0 100644
--- a/Data/Scripts/999_Main/999_Main.rb
+++ b/Data/Scripts/999_Main/999_Main.rb
@@ -28,12 +28,8 @@ end
 def mainFunctionDebug
   begin
     Compiler.main
-    pbSetUpSystem
-    $data_animations    = load_data("Data/Animations.rxdata")
-    $data_tilesets      = load_data("Data/Tilesets.rxdata")
-    $data_common_events = load_data("Data/CommonEvents.rxdata")
-    $data_system        = load_data("Data/System.rxdata")
-    $game_system        = Game_System.new
+    Game.initialize
+    Game.set_up_system
     Graphics.update
     Graphics.freeze
     $scene = pbCallTitle