2 Games in 1: Sonic Battle + ChuChu Rocket!

Sonic Battle is a fast paced pseudo-fighting game, akin to Super Smash Brothers from Nintendo. Rather than being 3D side-scrolling, this game employs a 3D isometric view- not a static, sprite-based field though, it is comprised of actual texture-mapped polygons. The character sprites are 2D though, and while you think it wouldn't work- it does :P You can have 9 characters to choose from, 5 modes of play; Story, Battle, Challenge, Training, and Mini Games; you can link up 4 GBA's to fight your friends, each character has a bunch of moves you can use to beat the you-know-what out of whoever you're fighting. It has a system of selecting Aerial, Ground, and Guard based attacks, and depending on what type of attack you set for which area (aerial/ground/guard), you have a possibility of 9 total different special attacks to choose from (only 3 at a time in a match though) which you can change each time you lose 1 stock point.

ChuChu Rocket is an action puzzler, designed predominantly as a multi-player game. You have indirect control over mice, and must guide them to the safety of a rocket, and away from a cat. You do this by placing arrows on the ground, which they will follow. The multi-player game is a frantic all-against-all duel, in which each player's mice will only follow instructions of their own colour. You can play this mode on your own against CPU opponents, or take on a series of predefined puzzles