Reversing a YYC game is vastly more difficult. Traditional GMS2 decompilers cannot simply extract a project file from a YYC build. Instead, a developer would need to use advanced binary analysis tools (like Ghidra or IDA Pro) to read raw assembly language. Even then, variable names and project structures are completely lost. ⚖️ The Legal and Ethical Landscape
When a decompiler targets a GameMaker VM export, it parses the data.win file (or equivalent) and attempts to reconstruct the project structure. A successful decompilation usually yields:
GameMaker Studio 2 has become a global standard for creating 2D games, powering indie sensations like Undertale , Deltarune , Hotline Miami , and countless others. But for developers, modders, and curious players alike, a persistent question remains: Can a finished, compiled GameMaker game be turned back into an editable source code? This comprehensive guide explores the world of GameMaker Studio 2 decompilers—how they work, what tools exist, the legal landscape, and how you can protect your own creations.
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The most prominent tool in this ecosystem is . Despite its name, UTMT is a fully-featured open-source data editor and decompiler for almost any modern GameMaker Studio 2 game. Core Capabilities of GMS2 Decompilers
Despite its name, this is the definitive, open-source decompiler and editor for data files built with GameMaker Studio 1 and 2. It features a built-in GML decompiler for VM builds, allowing users to view scripts, modify variables, and export sprites, audio, and code.
[Compiled Game Executable] │ ▼ [Extract data.win] ──► [Parse Formats (TXTR, STRG, CODE)] ──► [Reconstruct Project] │ ┌─────────────┴─────────────┐ ▼ ▼ (Extract Assets) (Decompile GML) Reversing a YYC game is vastly more difficult
GameMaker Studio 2 compiles projects into platform-specific binaries and packaged game assets. “Decompiling” in this context usually means extracting resources (images, sounds, objects, rooms) and recovering GameMaker Language (GML) code or equivalent logic from a built game.
The VM export is the default and fastest way to test a game.
However, the legal situation isn't uniformly prohibitive. Some argue that "decompilers are not illegal. It's just a particular way to do reverse-engineering". The primary restriction comes from EULAs you agree to when using GameMaker. As one community member notes, "The only way you could be not allowed to do it is if you signed a EULA saying you will never reverse-engineer or decompile the software in question". Even then, variable names and project structures are
When you export a game without enabling the YoYo Compiler (YYC), GameMaker produces bytecode intended for its virtual machine. This VM bytecode runs inside an interpreter bundled with each game. From a decompiler's perspective, this is the most accessible target.
In many regions (including the US under the DMCA and Europe under software copyright exceptions), reverse-engineering for the sole purpose of creating interoperable software or community modifications is protected, provided you legally own the game.