Cheats for The Simpsons Game on PSP.
From the main menu, go to the Extras menu and enter one of the following cheats to unlock the corresponding effect. If you entered the cheat correctly you will hear Bart laugh.
Left, Square, Right, Triangle, Right, L.
Unlocks all Clichés.
Square, Left, Square, Right, Triangle, R.
Unlocks all Movies.
Triangle, Left, Right, Triangle, Square, L.
Gives all your characters unlimited power.