A new cooperative game at Grain de créa, it's a wooden labyrinth mounted on hydraulic pistons that must be synchronized to move forward... Move the ball through the maze by moving the board with the syringes filled with water. Ydrody works using an ingenious principle of communicating vessels. A lot of fun to look forward to. This wooden game works on communication, dexterity, coordination and delights young and old. Diameter of the board: 28 cm.