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, and generally saying "sorry" is discouraged, as everyone makes mistakes--just play for the fun of it!
Points can be tracked by the number of "hacks" accomplished over a certain duration or before the footbag is dropped.
Did you know?
Hacky Sack is the classic game adapted in America by John Stallberger and Mike Marshall's game in 1972, which is very similar to the traditional Chinese game Jianzi (played with a feathered shuttlecock instead of a footbag).