tl;dr: The developer of Babylonian Twins, a 1993 Amiga game written in 68000 assembly, used Claude Fable 5 in Claude Code to port both his 2010 C++ engine and the original 72,758 lines of undocumented assembly into Godot 4 over a weekend. The LLM reverse-engineered proprietary file formats, rebuilt the original binaries byte-identically with vasm, recovered a lost map editor, and even handled store listings and localized screenshots—though it introduced subtle bugs like a guard AI missing an upper-bound check. The Definitive Edition ships on iOS/Android now with the original 1993 game bundled inside, and the original ADF is free on itch.io.