Secrets
Try and get as many secrets as you can throughout the game. I know it takes longer to complete then but trust me, when you get to the final bit and have the answer the computer identity test, it really comes in useful. NOTE: If you have Knowledge aspirtation I strongly advise you to get the Perk that allows you to get their Deep Dark secrets without hurting your relationship with that sim.
If you need more help, we've got more The Sims 2 cheats and also check out all of the answers for this game
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