Maracana

1. Adults play it on a handball-sized court. For children, mark a pitch about 30 metres long and 20 wide, with a small goal at each end and a zone in front of each goal, about 10 metres wide and 5 deep.
2. Two teams of six, no goalkeepers. Nobody uses hands, even to restart: the ball is kicked or dribbled back in.
3. A goal counts only if the scorer is inside the zone when striking the ball. Players from both teams may go into either zone.
4. Play games of eight minutes. With more than twelve players, each team swaps one player in after every goal.

A shot from outside the zone is worth nothing, so the player on the ball stops asking "can I shoot?" and starts asking "how do we get someone into the zone with the ball?" A dribble in, a pass to a teammate arriving at the right moment, a one-two at the edge. Without the ball, attackers time their runs into the zone, since a player waiting there is easy to mark. Defenders read which way in is coming and close it, because there is no keeper behind them.