Vertical wall of ramps and three wooden cars to run down it. Release a car from the top slope and it will flip onto the ramp below, roll down that one, perform another flip and then continue in this fashion until it reaches the bottom. There are three cars included in the set including a six wheeled vehicle with a flexible joint in the middle. This toy gets its name from the highly satisfying noise the cars make as they topple down it.
Age recommendation: 3+