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The awesome World of Goo by indie developers 2D Boy is now available as a universal app for iPhone and iPads. World of Goo is no half assed PC Port either the game has been redesigned specifically for your iDevices, the touch controls are very intuitive and you could be forgiven for thinking this version actually came before the PC version as it plays so intuitively.

There is also an iPhone only version which is slightly cheaper available either way this is up there with one of the games you simply MUST buy.