The Sims 2 - Platform: Nintendo DS

Getting things finished quicker:
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To get things done quicker, change the internal clock on your DS system. 
This trick works well if you want to get rooms built faster. Instead of 
waiting the normal eight hours, just set your clock ahead eight hours. 
If you need money get guests to stay, set clock forward the desired number 
of hours or days.

Additional aliens:
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To get more aliens on your save, set the system clock forward by one minute. 
Load your saved game and walk around for a minute. Save the game, then set 
system clock back to real time. The bellhop should say that you are a time 
traveler and that the aliens have launched a full scale attack. When you see 
the clock, touch it or you will lose all your sanity.

Shop secret:
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When at the shop buy a toilet,sink, shower/fridge. When you come off the menu 
it will sometimes say XXXUse special Social Ability etc.and give gift. I'm not 
sure what these do.

Short cutscene:
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At some point in the game, save your data and turn off the DS. Then set the 
internal clock back so that the current time is earlier than the time of the 
last save. When you load your game, you will unlock a short cutscene and have 
to fight off an alien invasion.

Run on air:
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When running down the stairs in the Main Lobby run against the rail and occasionally 
you will run on air above the room. If you stop running you will slowly float down.

Unlock Mongoo Monkey:
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To unlock Mongoo Monkey for the casino, play The Sims 2 DS while having The Sims 2 
GBA in the DS.