Use the arrow keys to move around and the mouse to look around to complete the game successfully. Hold down the left mouse button while aiming to fire with the right mouse button. To choose between weapons, use the mouse wheel for cycling between the various options on the screen. The letter G represents a grenade on a computer keyboard. To reload your weapon, hit R on your keyboard. To choose items, hit the F key. So on and so forth. When running, press the left shift key on your keyboard, followed by the left CTRL-key. The letter V can be prone with the help of the space bar on your keyboard.