Also known as ullamaliztli but the game is often called tlachco.
The court or tlachco is framed by two parallel walls, built at a low slope at the bottom so that the ball bounces upward to keep the ball airborne, and inset with three round marker-disks or a single stone ring on each side, positioned several meters above and at right angles to the ground. Hitting the disks with the ball earns points, and the players score 'goals' by passing the ball through the rings. The ball is not permitted to touch the ground. Two opposing teams face each other from opposite sides of the open court; the ball bouncing off the players and off the stone walls. The ball is allowed to bounce off a player's elbows, hips, knees and head - but touching the ball with the hands is an illegal move.