The Sims

Note:-In order to do any of the following codes you must:
1. Get to the title screen. (where you choose get a life, etc.) 
2. Hold L and R briefly (about two seconds). 
3. A screen should pop up where you you enter the codes. 
4. Press delete to get an empty space to type your code.

Code	Effect	Thanks to...
SIMS	Lets you have play the sims mode without having to go to get a life mode and have the dream (helpful if you have no memory card).	Jet Falcon
FREEALL	Makes all objects free (exception-Bills.) But you can't sell anything for cash. hint-buy a ton of really expensive things (with code on) then save it leave and come back and sell it. Ka-ching	Jet Falcon
FISH EYES	Allows first person view when you press X (makes walls go up and down)3 times.	Jet Falcon
PARTY M	Unlocks two player party motel.	Jet Falcon
MIDAS	Unlocks all items skins etc. (basically everything)	Jet Falcon

Perfect Mood
EASY PROMOTION
This code allows your Sim to always have a perfect mood so you can easily get promoted. First, build a house and your Sim should start out with a perfect mood. Then you get to do the things you normally do until your Sim gets in a bad mood. Go back to your neighborhood and evict your house's family. Select that same house and move the same family back in and your Sim will be in a perfect mood again with all the same stats as before.
(Thanks to rsdotter@epix.net)

Reveal Gnomes
Down, L, Z, R, Left, Right.
Be sure to enter the code at the Main Menu.
(Thanks to MACBIGBOX@aol.com)

Unlock all locations
Left on D pad, Right, Left, Z.
(Thanks to Lildevil4eva05@aol.com)

Unlock all objects
down, Z, up, up, R.
Be sure to enter the code at the Main Menu.
(Thanks to MACBIGBOX@aol.com)