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: Images (sprites), audio files, and fonts used in the game.
It's crucial to understand that there is no official or public, fully-functional, one-click decompiler for GameMaker Studio 2 games on the level of the infamous GameMaker 8.1 decompiler of the past.
This is your first and best defense. YYC turns GML into C++, then to native machine code. The output is far more difficult to reverse into meaningful GML. Most public decompilers (UndertaleModTool) struggle or fail with YYC games. gamemaker studio 2 decompiler
As a GameMaker developer, the existence of these tools shouldn't discourage you, but it should alter your workflow. Always build your commercial releases using the to ensure your hard work, code logic, and creative assets remain secure.
before compiling to native machine code. Decompiling YYC builds often yields "machine-written" C++ or Assembly that is extremely difficult for humans to read and cannot be easily re-imported into GMS2. 2. Required Tools and Setup To decompile a GMS2 game, you typically need to locate the file, which contains the game's assets and bytecode. UndertaleModTool (UTMT)
While the legalities are generally clear, ethical questions are more nuanced. Whether you need recommendations for specific Share public
: Generates bytecode alongside a runner. This is the standard target and is significantly easier to decompile because the logic remains as structured bytecode. YoYo Compiler (YYC) : Transpiles GameMaker Language (GML) into
UndertaleModTool has a built-in "Decompile" button, but for GMS2, it is often experimental.
: A command-line tool written in F# that can extract all scripts from a file into text files using the YYC turns GML into C++, then to native machine code
is a newer, focused library designed for GameMaker VM analysis, compilation, and decompilation, often used as a backend for larger modding tools. Because it’s a library rather than a standalone app, it requires some technical knowledge to use effectively.
Have your game check its own executable hash or data.win checksum. If modified (e.g., by a decompiler that repacks assets), crash gracefully or display a message.
: A project written in F# designed to retrieve and decompile scripts from a game's
💡 While powerful for learning and recovery, decompilers should be used with respect for the original creator’s hard work and legal rights. To help you dive deeper into this topic: Do you need a tutorial on how to protect your own GML code?