your feet unless it is caught in the air. Then the ball can be passed back forth (no forward passes though, except for shots on goal) between teammates as you run down the field.
A header in the goal is worth 3 points, a kick is 2, and a throw in is 1. Seriously a very fun game.
I thought it would be a little more widespread than it is. We played in Moscow, and I just got an email from a newphew in Mozambique mentioning that they play it there. I was curious to see where else it is played.