Move with WASD or Arrow keys. Use the mouse to target, left click to shoot, space key to enter upgrade shop. 1=Normal weapon. 2=Grenade Launcher. 3=Cannon. 4=Rocket Launcher. Use H and I for help and hints, G to set the graphics quality, F to see your own status and E to repair turrets.

Join Marine Special Forces and fight off the invading enemy forces! Equipped with a machine gun, rocket launcher, grenades and more! Spend your money on upgrading your armour, weapons, turrets etc.