In the beginning, you roam the Earth, capable of absorbing only the tiniest of objects. A glass marble you collect becomes your head, and a pair of jellybeans becomes your hands. Small creatures overwhelm you, with rats kicking you around and golden retrievers threatening to stomp you to pieces. But with every object you collect, your puppet self grows larger. Eventually, you'll become a towering behemoth with fire engines for arms and the ability to absorb entire buildings.
So, go on -- steal the whole world before it's too late!