• The player controls 2 ships at the same time, one on each screen.
• Each ship also has there own colour, 1 blue 1 red.
• Each ship also fires bullets based on their colour.
• There are 3 colours of asteroids; blue, red and gray.
• The play must shoot the right asteroids with the right colours, this is done by allowing the ships to change screen.
• The ships are moved at the same time, but shooting it done by a per ship basis.
• When a ship gets hit it will get knocked out of the game area, the ship will return after a short while. 
• The game is lost when both ships are lost at the same time.

Via PAlib