Mr Driller Drill Land.
It was even underappreciated by the Japanese, who supposedly eat that shit up. It's seriously one of the best games I've played in recent years. If you have passed on the game or have simply never heard of it, or discounted it because you thought it looked lame, you're part of the problem. Or perhaps you've played the Dreamcast version and feel like you've already seen it all. Little do you know that Mr Driller for DC is practically a demo disc for Drill Land, which completely blows the doors off with its 5 unique gameplay modes, 4-player race and battle modes, and tons of rad unlockables. Oh, perhaps best of all, it has one of the most brilliant soundtracks you will ever hear in a game. We're talking Katamari-good - in fact, when Katamari Damacy first came out, several GAFers immediately compared the music to Drill Land. That's powerful stuff!
Hey, if you guys can make me give Buffy a look, I should be able to pique your interest in one of the best puzzle games ever, eh? It's pretty cheap, to boot!