So far I've got through:
- SMB and Sonic of course
- Total Annihilation
- Dungeon Keeper (really good design mode)
- Contraptions (another good design mode game)
- Creatures
- Grim Fandango
- Monkey Island
- Populous
- SimCity (Original version)
- Lemmings
- Repton (great design mode)
- And of course Windows-Bundled Minesweeper that hasn't changed in about 20 years
Like Bill the Demon and Lost Mind of Dr Brain.
But given that they are the only two games I can think of off the top of my head, I can't be bothered to find an OS9 emulator and an OS9 image for me to run, and I am certainly not buying an old Mac.
And let's not forget good old Acorn games. Hmm. Actually, I've forgotten all of them apart from Repton. Can't have been any that impressed me then.