//FightCode can only understand your robot //if its class is called Robot var Robot = function(robot) { }; Robot.prototype.onIdle = function(ev) { var robot = ev.robot; robot.ahead(100); robot.rotateCannon(360); }; Robot.prototype.onScannedRobot = function(ev) { var robot = ev.robot; robot.stop(); robot.fire(); robot.turn(25); robot.ahead(50); robot.rotateCannon(-30); robot.fire(); };