<<<<< ALIENS >>>>>

Joypad1 left: left.
Joypad1 right: right.
Joypad1 up: up.
Joypad1 down: down.
Joypad1 fire1: fire.
Joypad1 fire2: enter door.

Joypad2 left: play Ripley.
Joypad2 right: play Burke.
Joypad2 up: play Vasquez.
Joypad2 down: play Bishop.
Joypad2 fire1: play Gorman.
Joypad2 fire2: play Hicks.

Pause button: pause game and view stats (Joypad 1 fire1 = unpause / Joypad 1 fire2 = abort game)