After making the rocket that leads you to the last cave, do NOT talk to Momorin to receive your booster back. Instead, just take the rocket and keep your Mimiga Mask to see different dialog and some of the portraits displayed during the credits will be altered as well.
Unlock the following endings by performing the corresponding tasks:
ENDING - HOW TO UNLOCK Bad - Leave with Kazuma after your second time through the Egg Corridor. Normal - Complete the escape sequence without going through the Sacred Grounds. Good - Complete the Sacred Grounds area. Make the rocket that allows access to the last cave, but do not talk to Momorin to get the booster back. Use the rocket and keep the Mimiga Mask.
Note: This requires the European or updated version of the game. Highlight the "Music" option at the "Options" menu. Press 1 to go forward, then 2 to go back. While the music is playing you can switch between "Old" and "New" to hear the music from the original version or THE New version.
Unlock the following costumes for Quote by entering the corresponding codes at the title screen:
COSTUME - CODE Blue - Hold B and press 1, 2, 1, 2, 1 three times, Up. Christmas - Hold B and press 1, 2, 1, 2, 1 three times, 2 two times, Left. Halloween - Hold B and press 1, 2, 1, 2, 1 three times, 2 two times, Plus two times, Minus two times, Right. Red - Hold B and press 1, 2, 1, 2 two times. Yellow - Hold B and press 1, 2, 1, 2, 1, Down.Interchange Quote and Curly - Hold B and press 1, 2, 1, 2, Down.
After making the rocket that leads you to the final cave, do NOT talk to Momorin to get your booster back. Instead just take the rocket and keep your Mimiga Mask. There will be some dialog change after this point and some of the portraits displayed during the credits will be altered as well.
Acquire the Jellyfish Juice and use it on the fireplace in the Assembly Hall in Mimiga Village to the Bubbler. You can hold [Down] when it is equipped and form a total of one hundred bubbles that deflect blockable enemy attacks and inflict plenty of damage because of all the sharp stars it releases. It is also useful when facing a lot of enemies, such as the hordes of birds that fly over to you and follow in the Sand Zone. Also, try it when in the Labyrinth and an enemy traps you by jumping up and attempting to attack. You can remain in any location and charge up the Bubbler; it will release the stars and hit the enemies for you. In the Sand Zone, use it as a shield and launch the stars. It can even be used to get the Arms Barrier. When fighting Monster X and he releases the heat-seeking fish-like missile projectiles, the Bubbler protects you and eliminates them in a single hit. You can also use it against Balfrog to block all his missile attacks.
While going through the Mimiga Village, collect the Map item. Use the Map in the back room after taking out Curly in the Sand Zone to find a secret passage. Use the Map to reach the end of the passage, then use the "Look" command on the ledge on the left to get Curly's underwear.