Masteroids is a multiplayer Asteroids clone for the Wii. It currently allows up to 4 players to simultaneously play the classic Asteroids game. Gameplay is customisable with an options menu allowing you to alter the amount of lives each player starts with, the amount of bullets a player can fire, whether team killing is allowed, the difficulty and how many players there will be in Multiplayer mode.

http://wiibrew.org/index.php?title=Homebrew_apps/Masteroids