Bomberman 64

Bonus World
Collect all 100 Gold Cards and beat Altair again to gain access to the bonus world Rainbow Palace.

View Credits
Beat the bonus world by defeating Sirius. Then, go to the options menu and you can see the credits.

Sound Test
Beat the game in Adventure Mode (normal difficulty). Then go to the optins menu to access a sound test option.

Extra Battle Mode levels
Go to the game selection screen and press Start very fast and repeatedly until you hear a chime. You will then have 4 extra levels in Battle Mode.