Instructions
Press the "CTRL," "Shift" and "C" keys at the same time on your computer while playing The Sims 2. A blank field appears at the top of your screen.
Enter "boolprop testingcheatsenabled true" in the field, then press "Enter." Cheats for the game are now enabled.
Hold down the "Shift" key and press the mailbox in front of your Sim's home. Options for your Sim household appear.
Click "Make All Happy" to raise the happiness level of all your Sims.
Hold down the "Shift" key and click the mailbox again. Click "Make Needs Static." All of the Sims needs will stay up all the time without you doing anything or accessing the cheats menu again.