So, one of the cars pushes a lever, which activates the machine. The cars continue racing down the track as a silver marble passes them and pushes a domino that causes a domino effect. Eventually, the last domino pushes a group of marbles down a track. All of them, except for the red one, fall off the track, while the red marble pushes a lever that causes a water tower to pour water into a plastic tub. A few seconds later, the cars fall into the water. The red marble returns to activate a lift that lifts the cars out of the tub and allows them to continue on the track.