The Sims Codes

Cheat Code List
At the main menu, press L1+R1+L2+R2 and you'll be able to acess the cheat menu:

Freeall: All objects are free.
Midas: Unlock all two-player games, objects and skins.
Party M: Unlock Party Motel game.
Sims: Unlock 'Play the Sims' without going through 'Get a Life' mode.

http://www.playstationpro2.com