An alien pretends to be human and his goal is simple: destroy all life forms in planet Earth. Can you stop it before it's too late? If you play in RAMPAGE MODE, you'll have to face endless hordes of enemies and your only goal will be to survive as long as you can.
W-A-S-D keys to move; click to shoot. Use the 1-6 keys to switch weapons, and the G key to launch a grenade. P key to pause the game. The 6th weapon is a gravity gun, that you can use to take objects and put them at a different place, thus modifying your environment as you need. A tutorial will guide you as you progress (click the signs), but anyway the game is enough intuitive to go on without using it.