Notes:
             This is a one-player game where you are attacked by drones and retaliate by firing your turret
             gun. The drones drop mines that migrate towards the turret and damage it. You also control a
             blue sweeper that moves along the ground and can destroy mines as well as picking up
             ammunition and repair tokens. 

             Controls: Pad Left, Pad Right, Pad Up, Pad Down: move Sweeper.

             Square: fire turret gun. Pad L1/R1: rotate turret left/right. 

Adrian Scoffield 1998.
Middlesex University.