From the Hasbro edition box:Tap out ice blocks one by one. They won't melt when you are done! Take your time and do some thinking to keep the polar bear from sinking. To win, the bear must stay on top. One wrong block-he'll go ker-plop!Children's game of tapping out 1' ice blocks in a plastic frame, with the goal being to force the other player to be the one that causes the central 2'x2' square to fall (taking the polar bear with it). - BoardGameGeek