Key Lime Pies

Key Lime Pies appear in the planet Utopia, in the game Angry Birds Space. Key Lime Pies are indestructible. Also, key lime pies are shown variously in the second page of the planet of utopia. They are a bit bouncy, but work more as a object to hold things such as bouncy strawberry jelly or structures.

Appearence
They are a piece of pie with a lime jello on top.