The Sims

Cheat mode
Go to the main menu, then enter L + R triggers to unlock the
cheat option. Enter any of the codes bellow to activate the cheats:

Midas mode
Enter "MIDAS" in to Cheat menu.
Start a game in Get A Life mode. Get into the hot tub with the girl, after
pause the game play. Choose "Quit", after select "Just Quit".
This mode unlock all 2 player games, all objects, and all skins.

First person view: Enter "FISH EYE" in to Cheat menu.
To change between first persona nad normal view, press Circle.

Play The Sims mode: Enter "SIMS" in to Cheat menu.

Free mode - Every objects cost is 0 Simoleans:
Enter "FREEALL" in to Cheat menu.

Unlock Party Motel 2 player options in Get A Life mode:
Enter "PARTY M" in to Cheat menu.

Unlock all objects: Finish Get A Life mode