Successfully complete the game to unlock a sound test selection on the options screen.

Collect all crystals in the game (it will say 100% on your file at the file selection screen) to unlock Boss Battle (Bosubuchi) and Movie Viewer (Zenbu Miseru) modes.

Successfully complete the mini-games on the easy difficulty setting to unlock the normal difficulty setting. Complete the mini-games on the normal difficulty setting to unlock the hard difficulty setting. Complete the mini-games on the hard difficulty setting to unlock the intense difficulty setting.

To get an extra life, get the star at the beginning. Press Start and select "Try Again". Go to the same level and go back to get the star again. Repeat this as many times as needed to collect an unlimited amount of lives.

Pop Star Boss

Best weapon: Flame Sword (Cutter, Flame). Use the sword to destroy the tiny trees, then hit the spikes that come out of the ground.

Rock Star Boss

Best weapon: None. When you get all the way to the top, suck on the atom objects and throw it at one of the cubes.

Aqua Star Boss

Best weapon: Flame Sword (Cutter, Flame). When the shark is in front of you, throw the sword at him. After he faints, hit him when he swims up at you.

Neo Star Boss

Best weapon: Anything that throws. When the lava comes out of the ground, hit it. He will faint and then chase you. When he is not doing anything, jump and throw whatever you have at his mouth.

Shiver Star Boss

Best weapon: Anything. When his hands are in range, hit them. He then turns into a jet. Go for the pincers.

Ripple Star Boss

Best weapon: Random. When he turns into something, hit him with that. For example, when it turns to lightning, hit it with lightning.

Fire: Fire ball
Fire + Stone: Rock shooter
Fire + Ice: Ice and fire blower
Fire + Needle: Bow and arrow with fire arrow
Fire + Bomb: Fireworks
Fire + Spark: Solar powered fire
Fire + Cutter: Fire sword
Fire + Fire: Fire bird
Stone: Rock
Stone + Ice: Skating soap
Stone + Needle: Drill
Stone + Bomb: Dynamite
Stone + Spark: Electric rope tied to stone
Stone + Cutter: Stone cutter
Stone + Stone: Big rock
Ice: Ice blower
Ice + Needle: Snow flake
Ice + Bomb: Snowman bomb
Ice + Spark: Refrigerator (food gives you health)
Ice + Cutter: Skate
Ice + Ice: Snowball
Needle + Bomb: Spikey bomb
Needle + Spark: Thunderbolt
Needle + Cutter: Bite (commercial)
Needle + Needle: Spikey gadgets
Needle: Spike ball
Bomb: Bomb
Bomb + Spark: Light bulb
Bomb + Cutter: Bomb that hooks onto opponent
Bomb + Bomb: Missile launcher
Spark: Electric shock
Spark + Cutter: Electrical double bladed sword
Spark + Spark: Electric ball
Cutter: Boomerang
Cutter + Cutter: Boomerang with blades

There are various walls that must be broken by specific abilities. The ability depends on the color of the wall:

Light Brown: Spike
Brown: Rock
Red: Fire
Green: Cutter
Black: Bomb
Blue: Ice

Extra Star Piece or Treat

Return to the beginning of most levels to find a Star Piece or Treat.

Easy Enemy Info (?) cards

Get the Firework power (Bomb + Fire) and go to the first level. Press B whenever you encounter an enemy. At the bonus game, try to get the tan square with the "?" on it.

Defeat an enemy without using a power

Get under an enemy that you want to defeat. Then, jump under them and they will freeze for a few seconds. Jump under them two times in order to defeat them.

Defeat the last Boss

The final Boss can only be damaged by using the power that he has.