Ready. Set. Stack! Tower Stack is the head-to-head stack and balance building challenge. Blocks are carefully balanced on the rocker base that could tilt over any time. Think you've got a steady hand? Then it put it to the test. Just don't let the suspense get to you… Each player takes turns to draw a card from the deck and do what it says - add a block to the stack, move a block, draw another card, or reverse the direction of play between the players. Keep the stack going until it falls.