Sim Modder

Sim Modder is a cheat which can be accessed by using boolprop testingcheatsenabled. It was first introduced in The Sims 2: Nightlife. Simply bring up the cheat box by pressing "SHIFT" "CTRL" and "C". Type boolprop testingcheatsenabled true. While holding down shift, click on one of your Sims, and many options should appear. Click on "Spawn". Then, look through the options until you find "Sim Modder".

Sim Modder appears as a baby standing up. This cheat can:


 * Give your Sims maximum skill points
 * Change Sims age
 * Change Sims aspiration
 * Make/Cure vampires
 * Change relationships with other Sims
 * Increase/Decrease Sims aspiration points
 * Add or remove want slots/locks

And many other things.

Note
A version of the Sim Modder can be found on Mod the Sims 2 as a buyable item.