The Sims 2 Codes -

Cheat mode:
Enter the "Buy Perks" screen from the Info menu then hold + + . A "Cheat" perk will appear, showing a free Woo-Hoo icon. Buy it to get a money boost, some skills, clear your needs, and fill your Sanity.

Baker mission:
To get the bakers to leave the room so you can hack in to his secret room, examine the dresser in their bedroom. Then, give the wife the note. You can now hack into his secret room.

The Night-Beast mission:
Annie Howell is the night beast. She will tell you if you intimidate her.

Baby Tycho:
Baby Tycho is in the secret sublevel in the laboratory. There are two ways to get in to get him. The first is to intimidate the Man In Black. The other way is to intimidate the white haired scientist (not the man who gives you the problem or the alien, Mr. Smith).

Second ghost goal:
Go to the Rossum's house and complete their set of goals to get to the graveyard, which is in the meeting house at Deadtree. This can be very difficult -- Keep saving the game the farther you get.

Flirting with same gender Sim:
You can flirt with a Sim that is the same gender as yours once the other Sim's Flirting bar is filled up all the way.