It is played on a large plastic mat that is spread on the floor or ground. The mat has four rows of large colored circles on it with a different color in each row: red, yellow, blue and green. Due to the scarcity of colored circles, players will often be required to put themselves in unlikely or precarious positions, eventually causing someone to fall. A person is eliminated when they fall or when their elbow or knee touches the mat. There is no limit to how many can play at once, but more than four is a tight fit.