Hacky Sack (or "circle kicking") is played by kicking a footbag to each player in a circle. Play to keep the footbag in the air for as many rounds as possible. A round is counted after every player has kicked the footbag, while the footbag is still in play and has not touched the ground. This is sometimes called "getting a hack." One of the fundamental rules is to not touch the footbag with your hands.