On the pirate ship level, notice that there is a side quest called "Arctic Achiever" in room 2. You must go down the bridge and walk backwards. You will find a couple crates. One of them will have something in it. The others will have fairy-dust. When you break the crate with something in it, you will release Skipper (the penguin) from Madagascar. He will say, "We're going to the open spaces of Antarctica, to the wild!"
Activate the following cheats by entering the corresponding sequences of buttons at the specified screens:
CHEAT FUNCTION - CHEAT CODE 10,000 Gold Coins - At the gift shop press UP(2), DOWN, UP, RIGHT, LEFT. Secret Costume 1 - At the main menu, press LEFT(2), UP, RIGHT(2), UP, LEFT. Secret Costume 2 - At the main menu, press RIGHT(2), DOWN, LEFT(2), UP, RIGHT.