This project is complete. Contributions closed on 2026-11-02. The rebuilt source code is at github.com/momusdigital/fnv_decomp (you still need your own copy of the game). Next: Fallout 3, now open at f3decomp.com; your account carried over.
★ 100% · byte for byte · source released ★
We did it.
Every in-scope function of the game — 70,611 functions, 11,537,067 bytes — was rewritten in C++ by this community and compiles to machine code identical to the shipped executable. The complete source is now public.
Thank you to everyone who claimed a function, ran a lane, reported a bug or just watched the numbers climb. This is yours.
Reconstruction report · Fallout: New Vegas PC 1.4.0.525 · MSVC 2008 SP1
Rebuilding the game, one byte at a time
Every function counted here was rewritten in C++, compiled with the original 2008 compiler, and accepted only when its machine code came out byte-identical to the shipped game. This is the project’s final report.
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