Just saw this at my local Kmart today, called a few friends and we bought a cartload full of these. Great value at more than half price of their current toy sale catalogue!
This game engine was used to develop some very popular games of late (http://unity3d.com/gallery/made-with-unity/game-list) including Blood and Glory, Jelly Defence, ShadowGun, Battleheart and Muffin
I found this while I was on facebook and I thought I'd share it.
Simply create a facebook account if you haven't got one;
Go to the link: http://apps.facebook.com/freeonappstore/
and "Like" it.