I swear I'm not posting this entirely because of the kick-ass name. A few months ago I was telling my friend that I missed a classic game my grandpa had on his computer when I was growing up (needless sidenote: he had a track ball and windows so visiting was like traveling to another tech world from my mouse/mac setup at home). We both loved Chip's Challenge and after thirty seconds of searching for a modern version we found this. Not sure of the legality (some levels are copied directly I believe, but I know nothing of the status of CC).
Prime