About UndertaleModTool
UndertaleModTool is a utility for inspecting, unpacking, and modifying data from games made with GameMaker. It can decode game data files and recreate them, and its editor exposes many values for modification. The tool includes a basic room and level editor, plus a decompiler and compiler for the game’s scripting language. Users can also run scripts that modify game data and generate a debugger file for inspecting variables while a game is running. The product handles pointers when data structures change, helping preserve file structure during edits. The supplied description notes that some compiled code is unsupported and that a few language features are missing. It is a modding and reverse-engineering tool for compatible game data.
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