One by one, stack the wooden porcupines, being ever so careful. All the ridges and bumps on the porcupines' backs allow stacking in many different ways to create a tower of critters. Requires concentration and fine motor and balancing skills. Even so, children will delight in watching the porcupines fall, and then want to do it again! Set includes 36 wooden porcupines (2"). For 2+ players. Ages 4+.