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Tiny Towers is a free app for iPhone and iPad.
It is insanely addicting (at least for me)- I stayed up until 3 last night (more like morning) playing it).
The idea of the game is to build floors in your tower to earn money and tiny bucks. There are a few different types of floors you can build (residential, retail, food, service, recreation and creative) and then there are missions you can go on.
Super super addictive, plus it`s free so if you`re interested why not try?