Bomberman 64
Also known as: Baku Bomberman (Japan)

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A tough one!!
This will add four extra battle mode courses:
In the Gutter, Sea Sick, Blizzard Battle, and Lost at Sea. On the Title screen, highlight "Battle" it  flashing?. Rapidly tap the Start button until you hear a noise. The four extra stages will now be available. 
Note: Getting this code to work can be very difficult, as you must press the Start button very rapidly.


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