Sega Master System / Mark III / Game Gear
This is the latest game for which you need the light gun. It's not like the computer versions of the same name, but is instead an Operation Wolf-like excercise in target practice.
The screen slowly scrolls horizontally and enemy soldiers appear from the side of the screen or from behind objects. You have to blast them as fast as possible before they do too much damage. Other attackers, such as helicopters and tanks, are harder to take out.
The gun starts off on automatic fire and switches to single shot when the ammo runs out. There are also bombs which kill off everything on screen. Along the way you can rescue prisoners and pick up more bombs, ammo and life force.
If played properly, from a distance away, it's a very tough game. Even close up you've got to be very quick and efficient at blasting the enemy. Should satisfy anyone keen for an Op Wolf type of game.