The Sims 2

Plumb Bob Trophy (cheat gnome) code:
During a game play press L, R, Up, A, Z. You need to activate before
enter any other codes.

Get 9999 Simoleons:
Activate Plumb Bob Trophy, then press R, L, Z, Right, Left during game
play. Select the Gnome, then choose: Give Simoleons.

All lots available:
Activate Plumb Bob Trophy, then press X, B, Left, X, Up, X during
game play. Select the Gnome, then choose: Unlock All Locations.

Advance time by 6 hours:
Activate Plumb Bob Trophy, then press X, B, L, Up, Down during
game play. Select the Gnome, then choose: Advance 6 Hours.

Set Skill level:
Activate Plumb Bob Trophy, then press Y, X, B, Z, Left during
game play. Select the Gnome, then choose Change Skill - (name)/Change
to (number)

Horn:
Activate Plumb Bob Trophy, then press R, L, R, L, Y

All fashions:
Activate Plumb Bob Trophy, then press B, Z, Down, Right, B

Max motives
Activate Plumb Bob Trophy, then press Up, X, Up, Right, B

All recipes available:
Activate Plumb Bob Trophy, then press Z, B, Up, Down, Right, A

All objects available:
Activate Plumb Bob Trophy, then press B, X, Down, Left, Up

Programmer team image:
Press Right, Down, Right, Down, Right at the title screen.
Note: You don't have to enable the cheat gnome.
or
press Left, Right, Down, Right, Left, Right, Down at the title
screen. If the code is accepted, you should hear a a Sim voice.

Unknown cheat:
While playing press Right, Up, Right, Down, Right, Up, Down, Right
If the code is accepted, you should hear a a Sim voice.

Mode switch (Useful in Freeplay mode):
Press Select to toggle from Direct Control mode to Cursor Select mode.

Unlocking clothes:
Raise your Sim's relationships to 100 with everyone.