Setup. Two teams stand on lines 20 metres apart. Each team has two or three tiny cone goals, a metre wide, a couple of metres in front of its line. Two or three balls in play.
How it runs. Throw from behind your own line and try to get the ball through one of the other team's cone goals, below knee height. The other team defends them like keepers: catch it, block it, dive on it. A ball that is saved is thrown straight back. First team to five goals wins. Then swap ends and play again with a different kind of throw.
Make it harder. Weaker arm only. Then the ball must bounce once before the cone goal. Then play it with the feet: side-foot passes instead of throws.
With 4 keepers. Two against two, two cone goals each.