Whirl N Twirl is the one that runs itself. A motor drives the toothed lift wheel, carrying marbles to the top of the frame and releasing them onto the upper track. From there they find three ways down: a helical spiral, a zigzag switchback, and a long sweeping curve back to the base, where the wheel picks them up and starts again.
Its 230 laser-cut wooden pieces slot together without glue, and Level 7 earns its number: 4 to 5 hours of gear alignment and test runs before the loop finally closes.
The motor and battery case are in the box. Batteries are not included.
