Just been playing on my DS...
Plants Vs Zombies. Bloody addicting game! Played through the first 20 levels in a row lol. Not sure if its a game I would have bought (god bless flash carts

), because I'm not sure how much reply value it would have once you've completed all the levels. But I guess I won't know until I complete it.
Portal. Yes, Portal. THAT Portal. Sort of. A homebrew game that I *think* is based on a flash version of the game. Its in 2D and isn't as complex as the real deal, but for a homebrew puzzle game I'm really enjoying it. Not sure what else to say, since everyone knows what you do in the game, even if you haven't played the real thing (like me

).