[Robert Cawthon]

If you want to shoot things and have an interesting target, have bowling pins (plastic, of course) set up on the field. Shoot tennis balls at them. Robots cannot pass midfield. Scoring is done at the end of the game by how many pins left standing. Defense can either block balls or reset pins knocked over. Simple rules. Speed of ball and vertical angle must be limited but other than that, almost anything would go.