At the opening kickoff, all 11 pieces are relegated to their respective sides. Field players are moved during the game by using a circular disk to exert a downward force on the field pieces, propelling them forward (pieces may never be pushed with the disk). Field pieces are propelled forward to strike the game ball. The ball is either sent forward and then hit again with the same field piece the next play (i.e. "dribbling"), sent forward towards another field piece on the same team (i.e. "passing"), or towards the opposing goal (i.e. "shooting"). Players alternate manipulating their pieces based on the possession rules defined in each rule system.