This one is tough.
Back in the day I remember playing a game called "Boulder Dash". I wasn't aware of it at the time but there quite alot of games named "boulder dash". I've been trying to find the specific version in question but had no luck so far.
The only thing I can remember about it, and this will sound strange, and that is it involved green...cheese-like stuff that slowly ate away the screen until you died. (freak aint it?). Does this ring any bells?