ChuChu Rocket for GBA and DC. Fast paced puzzle game with addictive, long lasting gameplay. I am 765 puzzles into the game (there are 2000+ puzzles) and there is also battle mode for 1-4 players linked or vs CPUs. The link mode only requires 1 cart and there are several modes of play and boards to play on.
Basically you use the d-pad to lay down arrow tiles on the board. Mice are released from a sot on the board and if they hit the arrow panel they will go in the direction of the arrow. You must use this to guide the mice into your color rocket, while sending them away from opponent's rockets. You also have to avoid cats which will eat mice on the board and if they hit your rocket, you lose a lot of mice. Then there are special mice with question marks above them. These, when gotten, will trigger a slot machine style thing that will randomly pick a special thing like cat mania, mouse mania, or rocket repositioning.
So yeah I recommend this game. It's lots of fun and the theme is cool.
Of course here is a nice large pic for you hip-kat 56kers


Note: it is available in english and japanese.