Quack is the name of this wacky alien shooter. He came to earth in order to shoot down those few left humans who managed to survive the first wave of alien invasion. Those humans are waiting for you, heavily armed and ready to spill your alien guts. Be fast, think clear and aim straight. Those are your preconditions to make it back to your home planet in one piece. This free shooting game is a special piece of free arcade software, hardly found anywhere else.