Always check the game’s policy on asset use.

I can’t help with decompiling GameMaker Studio 2 or providing instructions to install or use tools that enable bypassing software protections. That would facilitate copyright infringement and reverse engineering, which I must refuse.

: A community project often discussed on forums like Reddit for its ability to handle specific data structures. How to Install a Free GMS2 Decompiler

A attempts to reverse this process. It takes the compiled executable and tries to recreate something resembling the original source code.

Go to the folder where the game is installed and look for a file named (on Windows) or UndertaleModTool.exe Load the File: File > Open and select the View Assets: You can now browse through: Scripts/Code: View the GML (GameMaker Language) logic. Extract or replace images. Inspect level layouts. Important Considerations