Every joy would be tears and sorrow, if not there's no life. The same goes to this game. Jumping game like this need surveillance from the adult as it can turn from bad to worse really easy. The starting point of the game would be a stroll in a park for the players, but as the line goes higher, the risk is also increase. The point when the player landing on their feet, they should know there's no margin for error as if they commit the mistakes when landing, bones-braking incident cannot be avoided. Below pictures show the likely injury.