Field Combat

Inside a walled-off arena, move your radar-equipped base around the play field to either shoot enemies with missiles or capture the attacking ground forces using your tractor beam. Enemies include infantry, mobile cannons, tanks, UFOs, and helicopters.

Shooting enemies awards points, but capturing them increases your supply of reserve forces. The capture beam takes longer to deploy, however, and makes your base vulnerable to attack.

Deploy your reserves by pressing both buttons at the same time. You can select which team you'd like by nudging the joystick either left or right. The quantity of reserves are shown in a table at the bottom of the screen. After about 30 seconds, if the reserves have not been destroyed or captured by the UFOs, they will return to base at the bottom of the screen.

Once all the enemies have been defeated or captured on a level, your base is moved on to the next. Fields vary in complexity and add more obstacles as the levels increase. The quantity and sophistication of enemies becomes greater the longer you are able to survive.

The game plays Wagner's "Flight of the Valkries" throughout the various stages.