Working as a team, players strive to stack 12 blocks before the Stack Smasher topples the tower. Spin a color and stack a block. Spin a challenge and add a tricky task. Could be stacking with one eye closed or while singing. Spin the Stack Smasher and get one space closer to the big topple. Players develop eye-hand coordination and balance and practice color recognition and counting. With three levels of play, Stack Up! challenges two to six players between three and five years of age.