Balancing Rock BlocksTumi ishi "The Mountain of Rocks" is a simple game that comes to us from Japan. The goal is to stack and balance the rocks into a pyramid tower without them tumbling down. Every rock is unique with its own shape, color, and size. This Tumi ishi wood rocks simple yet addicting it will educate and entertain your little ones and adults alike. Develop important skills such as perseverance, patience, and coordination. Exercise hand eye coordination,