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.
An add-on to the Top Chart
§999,999+
Open up an unoccupied lot or a lot that appears to be useless
An easy in-game cheat
Next, sell anything there and tear down the whole house
Then build a huge room, leaving behind two blocks of space remaining on all four sides and leaving behind one opening, use the most expensive wallpaper, and build picket fencing (they must scatter them in various lengths around the lot in order to get §1,000 and above)
Lastly, go back to the wallpaper section, use drywall, and began to tear down what wallpaper is being removed (thus, this will trick the game without harming the data nor lot and the player's family will be rich within a few minutes) (they must also hold down the L button to keep going)
The amount of time and button pressing will vary due to the amount of money the sim/family will receive each time the player removes. §1,000 and above will take around five minutes and slightly less time to get §999,999+. (Note: if the player's sim gets married to an individual, his/her spouse will have over one million simoleons if they choose to do the same thing for them.)