Lifetime happiness Cheats
When you start the game at the main menu press [Ctrl] [Shift] and the C key. A blue rectangular box will appear at the top of the screen, type in testingCheatsenabled true. Don't capitalize anything except the C in cheats.
Then load your game before you start to play do the same thing you did at the main menu screen then go to the chest and click it. When you click it you will see numbers which show your lifetime happiness then the chest.
Press and hold [Ctrl] then click between the numbers and the chest not higher or lower than the chest. Just start clicking until you find the right spot and you will get 500 point every click.
It seems to work well When you click a little closer to the chest
We have more cheats and tips for this game here, The Sims 3 cheats
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