You need to get to the end of the level destroying as many enemy units on your way as possible. Pick up bonuses and health packs - they are going to help you on your mission. The space commando is controlled by the arrow keys "left", "right", "up" and "down", or keys "W", "A", "S" & "D". Use the mouse cursor to aim. Use left mouse key to fire. To choose alternative weapons (if available), use keys "1" , "2", "3", or the mouse wheel, or directly the mouse cursor.