Rocketball is a sports-action Commodore 64 computer game released by IJK Software in 1985. Rocketball was coded by John Sinclair and has music by L Pilling. Rocketball is based on the futuristic sports movie Rollerball, released in 1975, starring James Caan. Rocketball's taglines were, "The rules are, there are no rules", and "This was never meant to be a game."