Alien Exterminator is an action packed online game that can be played in two different modes. The game will avail to you many weapons and various useful upgrades as the game play continues. The main objective during the game play is to move through each area using the available weapons to exterminate all the aliens that come attacking from all directions. Besides attacking the aliens it will also be important for you move constantly to keep safe distance from them. This is an engrossing online game that will require you to clear many areas crowded with aliens.