Some time ago I helped Jeff Olson open source his wonderful 1990s roguelike Alphaman: https://github.com/superjamie/alphaman-src https://github.com/superjamie/

Some time ago I helped Jeff Olson open source his wonderful 1990s roguelike Alphaman: https://github.com/superjamie/alphaman-src https://github.com/superjamie/alphaman-src It's full of optimisations to keep the code small, such as QBasic calling into C routines, as Jeff also wanted the source to all fit on one floppy disk.