Full of elaborate mechanisms and small tricks. The precise gear design provides smooth transmission speed ratio. Each gimmick will create dozens of fun to watch. You can also learn the fundamentals of engineering and structures of machines.
- A stair stepper as an elevator
- A spiral funnel, 2 straight rails, 3 curve rails
- A wheel lifter to bring marbles to the top
- A flip-flop as a switch to drive marbles to 2 paths
- A hand crank to run the whole system to move