The Simpsons Game Cheats

Cheat mode:
Enter one of the following codes at the main menu to activate the corresponding cheat function. Bart will laugh to confirm correct code entry. Note: Costumes and trophies will only be unlocked for the current game session.

Barts's costumes and trophies:
Press Right, Left, Square, Square, Triangle, R3 at the main menu.

Homer's costumes and trophies:
Press Left, Right, Triangle, Triangle, Square, L3 at the main menu.

Lisa's costumes and trophies:
Press Square, Triangle, Square, Square, Square, Triangle, L3, at the main menu.

Marge's costumes and trophies:
Press Triangle, Square, Triangle, Triangle, Square, R3 at the main menu.