The Sims 2 - Platform: Gamecube

Cheat Gnome:
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Press L, R, Up, A, Z 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, Z, 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 X, B, Left, X, Up, X 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 X, B, 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, X, B, Z, 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.

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.