The Sims 2 - Platform: XBox

Cheat Gnome:
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Press L, R, Up, A, Black during game play. The Cheat Gnome 
(Plumb Bob Trophy) will now appear on the lots and the following 
codes may now be enabled.

9,999 Simoleons:
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Enable the Cheat Gnome code, then press R, L, Black, Right, 
Left during game play. Select the Cheat Gnome, then 
Interaction/Location: Give Simoleons.

All lots unlocked:
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Enable the Cheat Gnome code, then press B, White, Left, B, 
Up, B during game play. Select the Cheat Gnome, then 
Interaction/Location: Unlock/Unlock All Locations.

Advance time by 6 hours:
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Enable the Cheat Gnome code, then press B, X, L, Up, 
Down during game play. Select the Cheat Gnome, then 
Interaction/Location: Advance 6 Hours.

Set Skill level:
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Enable the Cheat Gnome code, then press Y, B, X, Black, 
Left during game play. Select the Cheat Gnome, then 
Interaction/Location: Change Skill - [name]/Change to [number].

Development team picture:
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Press Right, Down, Right, Down, Right at the title screen. 
Note: The cheat gnome is not required for this code. A Sim 
voice will confirm correct code entry.

Alternately, press Left, Right, Down, Right, Left, Right, 
Down at the title screen. A Sim voice will confirm correct code entry.

Unknown:
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Press Right, Up, Right, Down, Right, Up, Down, Right during 
game play. A Sim voice will confirm correct code entry.

Mode switch:
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Press Back to toggle from Direct Control mode to Cursor Select 
mode. This very useful during Freeplay mode.

Controlling a dead Sim:
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Kill your Sim. There are a lot of ways to do this, but starting 
a fire is the fastest. Once your Sim is dead switch, to direct 
control (if not already in it). As a dead Sim you can walk through 
walls and talk to Sims. Terrorize, Wail, and Possess are social 
options dead Sims can do. Unfortunately you cannot actually possesses 
Sims out of social mode. These social options have no effect on other 
Sims, but are funny. You can also challenge the Grim Reaper in fiddle 
challenge. You have an unlimited number of chances to try this. If you 
win, your Sim will become alive again. You can also pay the Grim Reaper 
100 Simoleons for a Back To Life Ticket.

Unlocking clothes:
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Get your Sim's relationships to 100 with everyone. Every time you 
raise another relationship to 100, you will unlock a new article of 
clothing.

Hint:
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Submitted by: Harry

To do a PERFECT meal in The Sims 2 XBOX, go to the refrigerator (the alien 
type one) and select steak, broccoli, apple, and eggs put in in the plate 
and cook it. Then once you are done a message will pop up on the top of the 
screen and say: "You've just made a perfect meal!" Somthing like that. 
Hope it works for you!