Enter 5555 as a password, to be faster and more powerful.
Bomberman is invincible, and will blink, at the bginning of each stage. Drop a bomb. When it explodes repeatedly tap A and move around the stage to clear a large portion. Stop immediately before the invincibility ends to avoid damage.
Enter 5656 as a password, to become mini-bomberman.
Use a multi-tap accessory and hold right on controller five.