Wikia

See here for how to enter cheat mode.

Code	Result
FISH EYE	When you hit "O" (PS2) or "X" (GameCube), you move to first person on the selected Sim.
FREEALL	Makes items free (§0). You must still pay bills and pay for services.
MIDAS	Unlocks all items.
PARTY M	Unlocks the Party Motel two-player level.
SIMS	Unlocks "Play the Sims" mode, without having to complete the Get a Life storyline.

The Sims (console)/cheats