Excerpt from the book Sports the Olympics Forgot This book describes 40 sports that ought to be played but aren’t, because I made them up.
The other major difference in unicycle volleyball is that the ball is slightly bigger and softer than in normal volleyball; this means that it doesn’t generate the same speed through the air allowing players that extra split second to reach the ball before it hits the floor.
The rules state that a player “must have part of their body in contact with the unicycle when touching the ball”. In practice this means that players can’t jump off their unicycle to smash the ball over the net or to prevent the ball touching the court, however they can fall over with their unicycle to stop an opponent’s smash. If the player falls off their unicycle, they have to wheel their bike off the court, remount, and then return to the action at the back of the court. If a unicycle touches the net or goes under the net and intrudes on their opponents then the point is automatically given to the opposition.