Bomberman Cheats

Note: You must have the power-ups rubber bombs and kick.
During a multiplayer battle you can kick a rubber bomb at the wall, as it hits one of the walls you kick another bomb. The two bombs will collide and join together, forming and red dangerous bomb. This bomb will explode in a 5x5 square.

Note: this secret only works in Battle Mode while you are a Revenge Bomber. Say "Dangerous Bombs" (or otherwise make some type of noise in the microphone) into the mic on the DS and you will have Dangerous Bombs that explode in a 3x3 square.