Area 51

Area 51 — Using a light gun, you have to fight your way through the secret base Area 51, which has been captured by mutant aliens. As you make your way to the secrets in the heart of Area 51, you'll need to take down an increasingly dangerous line of aliens, upgrade your firearms, and cause as much collateral damage as possible. The game rewards the player for destroying windows, light fixtures, computers, explosive barrels, and even fire extinguishers. Each subsequent hit increases your streak rating (which is added to your score), and certain combinations of these side hits will unlock secret bonus rooms.