The Simpsons Game Cheats

Unlock all Lisa's costumes and trophies
Enter the following code while at the main menu. Costumes can be used and trophies viewed during the current gameplay session only.

[Square], [Triangle], [Square], [Square], [Square], [L3]: Unlock all Lisa's costumes and trophies.

Infinite Power
Head to the extras section of the main menu and insert the following code, which will give each of your characters infinite power: [Circle], [Left], [Right], [Circle], [Square], [L1.

Marge's Outfits & Trophies
To unlock all of Marge's trophies and outfits, head to the game's main menu and insert the following password: [Triangle], [Square], [Triangle], [Triangle], [Square], [R3].