Spent a few hours mucking about with one of my favourite games, Sonic R, with Claude Code as a co-pilot. Genuinely amazing how far you can get reverse-engineering this thing: swapping textures, tweaking the course layout, messing with character behaviour, even hacking together a fast-load straight into a stage so I could test changes without sitting through the menus every time.
Changing the lighting was the bit that surprised me most. Felt like proper dark magic.
Makes me wonder what becomes possible when LLMs get pointed at proper old codebases and binaries. There's a long tail of half-forgotten games and software that's suddenly within reach for tinkering.