Finding Nemo
  
PS2


Enter the following codes at the Title screen, then load a save or start a
  new game. Now pause during play and select the cheat option at the level select
  menu.


  


  Invincibility: 


Press Triangle, Square, Square, Circle, Circle ,Circle, Triangle, Triangle, Square, Square, Square, Circle, Circle, Circle, Circle, Square, Triangle, Circle, Circle, Circle, Square, Circle, Triangle, Circle, Circle, Square, Circle, Circle, Triangle, Circle, Square, Circle, Circle, Circle, Triangle.
Level Select:


Press Triangle, Triangle, Triangle, Square, Square, Circle,
Square, Triangle, Circle, Square,
Triangle, Square, Triangle, Square,
Triangle, Circle, Triangle, Triangle.
Secret Level: 


Press Triangle, Square, Circle, Circle,
Square, Triangle, Triangle, Square, Circle, Circle,
Square, Triangle, Triangle, Circle, Square,
Triangle, Square, Circle, Circle, Square,
Triangle.
View Credits:


Press Triangle, Square, Circle, Triangle, Triangle, Square, Circle, Triangle, Square, Circle, Triangle, Square, Square, Circle, Triangle, Square, Circle, Triangle, Square, Circle, Circle, Triangle, Square, Circle.
 

Thanks to Revolution readers Viktor, Pinknred, and j_j_j!