Puzzle Bobble, Magical Drop 3, Pochi and Nyaa, etc... they all are discussed here.
-Puzzle Bobble has to be my all-time favorite puzzle game. It's so addicting, especially so with the multiplayer!
-Pochi and Nyaa is very hard. At least it is for me. It's something I'd like to improve upon, though.
-I've only recently started to play Magical Drop 3 and I found it very fun. I need to get it for GGPO, but I don't know if people play that game there.