Viper for the Sony Playstation is a shoot em up action game. You enter your high tech helicopter, called the Viper, your job is to stop aliens who try to take over the world. You fight your way through many alien infested levels and try to reach the base of the enemy to wipe him out once and for all. You're flying through the levels on a preset route with a few check points where you can choose the path you will take. Many weapons can be picked up on your route to improve your fire power.