One player stands up the front with his back to the group.
The rest of the group start from a line at the other end of the room. Everyone must sneak up on the player up the front (the “target”), tossing a tennis ball to each other as they creep up to the target, keeping the ball hidden.
The goal is to “touch” the target with the ball. If the target sees the ball being thrown, the thrower must sit down until the end of the game.
The catcher must return to the beginning line with the ball.