Recommended age: +6 years. Number of players: 1. Box size: 12,5x11x11cm. Gear Ball is based on a revolutionary concept of interconnected gears. This unique mechanism creates a liquid spinning sensation that stimulates 70,000 nerve endings in the hands. Never before has a puzzle activated the brain so much. Twist and turn backwards to mix the colours, then try lining up the colours again to get a face of the same colour.