Do you, by any chance, remember an old Commodore 64 game where you're playing some treasure hunter...I think you're in some caves collecting diamonds. .....
I think the only game I played while on the Commodore was "Mario Brothers". I had a flight simulator also, but it was soooo slow.... you'd hear the big floppy disk turning and groaning and then the screen would change for a few seconds.
Wikipedia has a page with a lot of games for Commodore 64.
