Setup. A long, narrow pitch: about 60 metres by 20, with an end line behind each team. Two teams, one in each half. One ball.
How it runs. Kick the ball as far into the other half as you can: from your hands, off the ground, or a half volley. Wherever the other team stops it is where they kick from. If they catch it cleanly before it bounces, they get three big steps forward first. If they drop it, they go three steps back. You win the point when your kick lands and stops beyond their end line.
Make it harder. Weaker foot only. Then throws only. Then a kick that goes out of the side of the pitch costs five steps.
With 4 keepers. Two against two.