"As he digs into the specifics of his work, Szablewski takes the reader on a tour of PSX dev kits and how they handled Z-levels, how to translate yesterday’s triangles to today’s OpenGL, breaking the 30 FPS cap on a game that explicitly forbade that, and more. He takes the code from 40,699 lines to 7,731 and notably loved an excuse to work in C. “I had an absolute blast cleaning up this mess!”"
https://web.archive.org/web/20230825181726/https://arstechnica.com/gaming/2023/08/developer-rewrites-original-wipeout-from-abysmal-leaked-windows-source/
all games should release there source code (when they become abandonware)