When you're at the title screen and the word Start appears hold Up+A+Select.
Boss Fighting Tips
World 3: Before you fight Sweet Stuff, be sure you have Kine (the fish) and Spark power. The light bulbs Kine makes will act like torpedoes.
World 5: When fighting Mr. Shine and Mr. Bright, try to suck up and swallow the stars they make. The stars will give you powers.
Dark Matter:To kill Dark Matter, get all the rainbow drops. They will come together and form a sword. Hit him with it until he dies.
Cheat Mode
Collect all of the rainbow drops. Return to the Boss rooms and achieve a perfect score in all bonus rounds. Find a female blob in any stage, then complete the game to achieve a 100% score. Press A and select "Option" to fight the Bosses, access the bonus rounds, and start a sound test.
Full Options Game
For options for number of lives, sound tests, and other special options press Down+Select+B at the title screen.
How do get the rainbow drops
These are the powers to use on the blocks that seal the rainbow drops in their rooms.
World 1 Grassland Use Parasol Power World 2 Forest Use Spike Power World 3 Ripple Field Use Rock Power World 4 Iceland Use Fire Power World 5 Red Canyon Use Spark Power World 6 Cloudy Park Use Cutter Power World 7 Castle Dedede Use Ice Power
To get the last rainbow drop (in the last level), get and use the powers in the following order:
Fire Stone Spike Ice Cutter After going through the last door, you will be below the drop.
Invincibility
Hold up and press A+B+Start when you're at the title screen.
Pro game
Press Up+Select+A at the title screen to get a game with extra enemies and a new ending.
Random Percentage
Find a female blob after rescuing an animal helper. This may be easily done on level 5-3.
Secret Doors
There are several secret passageways hidden in the game. To find them get Kine (the fish) and the Spark power. Use the spark power in a dark room. You may see a picture and or door. If you see a door go through it. If you see a picture, try to go inside it as if it were a door.
Top Cloud Extra
After beating a room you will be launched off a cloud. When the cloud is going down press B and hold it. When you are launched wait until you pass 4 or 5 clouds, then press and hold A also. You should go all the way to the top cloud. On the top 3 clouds you will gain a star, a full health strawberry, and 1 live.