I've always been fond of Boulderdash games, going back to Rocman on the C16 when I was a kid, and a bit later the 2-player bedlam of Sullduggery on the ST.
I played this on my Jupiter Ace Emulator and found it amazing how much you've pushed the Ace to do - very smooth and fun. Wish I could say the same for my skills... I'll go back and complete level 3 at some point, I got so close and then did something stupid!