Pikmin
Challenge Mode
Save the game once and go to the main menu.

Get Fireworks!
Press down to have four Pikmin carry you back to your base camp to view a short fireworks disply.

Find Smokey Progg Worth 100 Pikmin
Go to the Distant Spring after day 15. Go to the southern lake area until you find a cluster of islands that look like a flower. Attack the egg in the center until it opens and the Smokey Progg will come out. Try to destroy it and take it to an onion and it will be worth 100 pikmin!

Destroy the Evil Fat Mushroom
First, you need 50 red Pikmin for this, when you get to the circular area that the Evil Fat Mushroom is in, dismiss 30 Pikmin, but keep them away from the mushroom, but not too far. Get the other 20 to attack it's legs (if it looks like it's sucking in air, get your Pikmin away from it!) hopefully, it will tip over. When it does, throw the Pikmin on it as fast as you can! When it gets upright get your Pikmin away, if they don't, the mushroom will spread a spore and turn them against you. Get your other 30 Pikmin to battle the evil ones, repeat this process until the Evil Fat Mushroom is dead.

Space Float
To get the space float you must first go to the Naval Base and find the blue onion. After you get a few blue pikmin, find a flower with a pellet in it and get one of your blue pikmin to slash it down. Don't do anything until a beetle-like creature comes and tries to eat it, when he does send 2 pikmin at the pellet. The pikmin will fight for it and drag the beetle back to the onion where the ray will pull the pellet and the beetle up and the beetle will get hurt. You will have to do this 2 times and when the beetle dies you will get The Space Float. Your Pikmin won't attack this creature any other way so that is the only way to kill it.

Make Captain Olimar Invincible
To make Captain Olimar invincible, simply press down on the D-pad. Olimar will lay down, then nothing can hurt him.

Get Purple Pikmin
First get 100 red, 75 blue, and 50 yellow pikmin. Once you do that, go to the Impact Site and take out 25 red, 25 blue, and 50 yellow pikmin. Go stand by the rocket and stay there for 5 seconds, then go to cardboard box. Make sure all your pikmin you took out are still with you. Go into the cardboard box and grab some bombs. Throw all the yellow pikmin with bomb rocks into the water and then put the rest of the pikmin back. Call it a night. The next morning, you will find the number of yellow pikmin you threw into the water have become purple. Purple Pikmin have the power of all 3 pikmin and are invincible!

More Pikmin
To get more Pikmin from a pellet than the number on the pellet you must send double the amount of pikmin required to carry the pellet.