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Sprite types

Action0 - Defines new graphics feature properties

Vehicles	Trains	RoadVehicles	Ships	Aircraft
Stations	Canals & Rivers	Bridges	Houses	Global Variables
Industry Tiles	Industries	Cargos	Sound Effects	Airports
Signals	Objects	Railtypes	Airport Tiles	Towns

Action1 - Defines a set of real sprites

Action2 - Defines graphics set IDs

• Basic Action2

Vehicles
Stations	Canals & Rivers	Bridges	Houses	Global Variables
Industry Tiles	Industries	Cargos	Sound Effects	Airports
Signals	Objects	Railtypes	Airport Tiles	Towns

• VariationalAction2 - Variational Action 2

VarAction2Advanced - Advanced features of Variational Action 2

Vehicles
Stations	Canals & Rivers	Bridges	Houses	Global Variables
Industry Tiles	Industries	Cargos	Sound Effects	Airports
Signals	Objects	Railtypes	Airport Tiles	Towns

• RandomAction2 - Randomized Action 2

Vehicles
Stations	Canals & Rivers	Bridges	Houses	Global Variables
Industry Tiles	Industries	Cargos	Sound Effects	Airports
Signals	Objects	Railtypes	Airport Tiles	Towns

• Callbacks - List of available callbacks

Action3 - Associates features (Action0 IDs) with graphics set IDs

Vehicles
Stations	Canals & Rivers	Bridges	Houses	Global Variables
Industry Tiles	Industries	Cargos	Sound Effects	Airports
Signals	Objects	Railtypes	Airport Tiles	Towns

Action3LiveryOverride - Change wagon livery to match the engine

Action4 - Defines text strings

Action5 - Defines specific base graphics sets

Action6 - Modifies the contents of the following sprite

Action7 - Conditionally skips sprites or jumps to a label

GameConfigFlags - Configuration flags for Action 7/9 Variable 85

Action8 - Defines GRFID, Name and Description

Action9 - (see action 7 above)

ActionA - Replaces TTD base set sprites

ActionB - Generates an error message

ActionC - Does nothing.

ActionD - Assigns parameters and calculates results

• ReadingOtherGRFParameters - Reading another GRF file's parameters
• ReadingGameSettings - Reading game configuration settings
• GRFResourceManagement - Preventing conflicts with limited resources

ActionE - Deactivates a NewGRF file

ActionF - Defines new town name styles

Action10 - Defines GOTO label for action 7/9

Action11 - Defines new sound data

Action12 - Load font glyphs

Action13 - Translates GRF-specific strings

Action14 - Static NewGRF Information (OpenTTD only)

RealSprites - Sprites that actually get drawn on the screen

RecolorSprites - Changing how other sprites are drawn

Graphics properties

• Palettes - Palettes used by the game
• Coordinates - Coordinates used for sprite alignement

TTD defaults

• DefaultHouseProps - Default property values for TTD's houses
• IndustryTileDefaultProps - Default property values for TTD's industry tiles
• IndustryDefaultProps - Default properties values for TTD's industries
• CargoDefaultProps - Default property values for TTD's cargo types
• VehicleIDs - Default vehicle IDs
• AirportTypes - Default Airport IDs

NewGRF commons

• Cargo classes - Commonly used cargo classes
• Cargo labels - Commonly used cargo labels
• Object classes - Commonly used object clases
• Railtype labels - Commonly used railtype labels

Misc

• Features - List of all features and feature-specific actions.
• Base Costs
• Vehicle Refitting
• GRF loading stages
• Global variables
• Storages
• String control codes
• Text IDs (TTD + TTDPatch + NewGRF defined)
• Syntax details
• Debugging NewGRFs
• TTDPatch error codes on loading NewGRFs

Game mechanics

• Town zones
• NML