Use these cheats as your name at the Login screen in XS
 
 
 Code - Description
 Alicat - Changes characters into cats.
 Chicken - Play as a penguin.
 Fishfort - Changes characters into penguins.
 Hungry - Changes characters into hippos.
 Medical - Secret Underworld level.
 Muddy - Play as a hippo.
 Pension - Secret Freezer level.
 Slither - Changes characters into worms.
 Smelly - Play as a cat.