Sound test:
Complete the first four levels of the game under the normal difficulty level of adventure mode.

Full power option:
Collect all 120 gold cards (100 from the normal worlds, 20 from the Rainbow Palace). A "Full Power" selection will appear on the options screen. This option allows any level to be started with maxed out Red bombs, and the remote item.

Preview custom Bomberman:
Press Z or R at the main custom Bomberman menu.

Secret Battle Levels:
Go to the menu where you choose your game (adventure, battle). Hit START repeatedly until you hear a noise. Then go into the Battle Mode and all 4 of the levels will be enabled.

Rainbow Palace bonus world:
Find all one hundred Gold Cards and defeat Altair.

Credits option:
Complete the Rainbow Palace world by defeating Sirius. A new selection that allows the credits to be viewed will appear on the options menu.

How the Gold Card system works:
For each of the first or third stages of a level, there are three cards that can be found by blowing up boxes. Before you begin a level, or when it is paused, there is a display of how many gold cards you have found or have yet to find. In the display, the cards you get by blowing up boxes will fill up the first three spaces. The next space is for the enemy card, which can be gotten on the 30th enemy killed in any stage. The last card is the time card. You will recieve it automatically if you beat the stage within the target time.

More music
To get extra music selections, just hear the music once and it will be enabled.

Full power option
Collect all 120 gold cards (100 from the normal worlds, 20 from the Rainbow Palace) in any level. A "Full Power" selection will appear on the options screen. This option allows any level to be started with maxed out Red bombs, 8 bombs, 5 firepower, and the remote item.

Multi-player adventure
To play as mini-bosses (Altair, Sirius, Regulus, etc.), get all 120 Gold Cards in hard mode. Player two controls Sirius (both), Regulus, Orion, Artemis, and Altair. Players three and four controls Regulus (the second one) and Altair's Vega ship.

Gold armor
Collect all 120 gold cards and successfully complete the game under three hours on the hard difficulty setting.

Samurai Suit
Get 120 Gold Cards under any difficulty setting.

Karate Suit
Successfully complete the game in less than three hours under any difficulty setting.

Gold Suit
Get 120 Gold Cards and successfully complete the game under the hard difficulty setting. This is easier to accomplish if you finish a normal game and unlock "Full Power".

Preview custom Bomberman
Press (Z] or (R) at the main custom Bomberman menu.

Quick recovery
Rotate the Analog-stick for a faster recovery when Bomberman is dizzy.

Big bomb
Press (A) + (B) in battle mode to hold a bomb in the air. Then, repeatedly press (A) until the bomb is big and has a glowing yellow circle around it. Push (B) to throw the bomb. For an even larger explosion, get the cherry bomb power up and do the trick.