To play a five player Battle mode, connect a GameCube controller to port 1. Hold R on the GameCube controller and select "Start Game" at the Wii channels screen. A controller selection screen will appear in which you can use any combination of GameCube controllers and Wii-Motes.
To access a stage-select and power-up configuration menu, play a one-player game until earning 300 points. Now kill yourself and select "END" from the "Game Over" screen. Wait for the game to run one round of action in demo mode. When the clouds appear on the screen before the BOMBERMAN title comes up, press DOWN and hold it while you press and hold Select + ONE + TWO. This must be done before the title unfolds on the screen. When the full title and "Game Start" menu appear, keep holding the buttons and press Run. DON'T RELEASE THE OTHER BUTTONS. When the intro sequence begins, press Run once more to reveal the "Special Select Room" menu.