mugen-unleashed: Reconstructing the 2013 M.U.G.E.N Engine in C

mugen-unleashed is a project that provides a full C reconstruction of the M.U.G.E.N 1.1 Beta 1 engine, originally built by Elecbyte in 2013. The project aims to produce a native mugen.exe that functions identically to the original binary. According to the README, the engine is fully reconstructed, with every function implemented in C and verified against the original executable using differential tests. The rebuilt engine successfully reproduces the original's behavior, including specific scenarios such as VS matches, AI vs AI matches, character selection, and menu navigation. The project explicitly aims to maintain the original's quirks and bugs, leaving potential fixes or new features for future development. The initial commit, dated October 23, 2026, credits Claude Opus 5.5 as a co-author. The project requires the user to provide their own copy of the original M.U.G.E.N 1.1 Beta 1 game data and DLLs to function. Further details on the analysis and reproduction of the original binary are documented in the project's README.