HAPE MIGHTY HAMMER DOMINOES - 59 PIECE SET - There?s movement and surprises at every stage of this fun, robot-themed domino set. Set the dominoes in motion and watch as they release a ball and unleash the mighty robot hammer. Robot hammer: As the ball in this clever domino set collides with the robot hammer, potential energy is released and more dominoes topple. Double-sided tracks: Includes two double-sided ball tracks: a regular track and a zig-zag track. See-through tunnel: View the ball's progress through the transparent tunnel. Momentum wheel: Momentum is transferred throughout the course by features including the momentum wheel, dominoes and ball. Finish-line flag: A finishing flag pops up for a dramatic ending as your last domino falls. STEAM value: Introduces children to the concepts of potential energy, momentum and gravity. Great for developing logical thinking and an understanding of the principles of physics.