At  the  main  menu,  press  L + R to unlock the cheat menu. Then
enter one of the following codes.

Code:                   Result:
MIDAS                   Unlock all 2-P games, objects & skins
PARTY M                 Unlock 2-P Party Motel game
SIMS                    Unlock Play The Sims Mode
FREEALL                 All items cost 0 simoleans
FISH EYES               First person view (press B)