here are some sims 2 cheat codes
hold ctrl+shift+c then type this code ( always hold ctr+shift+c to type in cheat codes)
boolProp testingCheatsEnabled true
This will allow you to keep all the sims levels up
You have to enter this code in the neighborhood before you select a lot to play on. After you go into the lot, right click on a sim. A menu will pop up. Click on Spawn then click on tombstone of life and death. A tombstone will appear. When you have people over, click on the tombstone then select make me friendly to everyone. This will make everyone there your best friend after you talk to them.
kaching=1,000 simoleons
motherlode= 50,000 simoleons
UnlockCareerRewards (only if you have University)
If you type in the boolProp code before making a sim, you can actually get the Maxis skin tones, eyes...etc that you can't normally get in the game. Before you type the family name hold shift+n. Then you'll get all the Maxis extras.