My latest iOS time waster is Disco Zoo brought to you by Nimblebit, the same developers that made Tiny Tower (KABOOM!).
In this game you have to use the helipad to visit areas and play a mini game to collect animals for your zoo.
These animals then generate income for you so you can visit the helipad again & constant loop. You get the idea now...
You can use Disco bux to start a disco & your income will double for a certain time. Occasionally you will be given tasks to find strayed animals across your zoo or given the opportunity to sell an animal for more cash.