It's a bit like footvolley, so you play the ball over a net.
teams of 3 or 4, you can have as many touches each / or per team but must get the ball back over the net within 30 seconds.
If the ball hits the sand (oh, it's played on soft sand) it's a point to the other team, and the team who let the ball hit the sand start the play off again.
Play is started by a serve - the ball must go over the net, but can in any manor, again the sicker the serve, the more points scored
There is also a load of judges (like snowboarding), and each team gets awarded and deducted points per time they receive then, pass the ball over the net.
Basically it's just two groups, keeping the ball up for up to 30 seconds, pulling of the best tricks they can, then passing trying to ground the ball over the other side of the net to stop the other team scoring..
I'm not really doing it justice!! But I saw some of the England beach soccer team playing it today and i was wicked, every player trying to out do the other, but this time you really can rub your opponents face in the sand wile doing it!