Move the cursor using the arrow keys.  Fire with the 5 key.  Each weapon has 6 shots. When you have shot all 6, you must reload by pressing the 7 key.  Shoot the health powerup to gain an extra life.  Shoot the shotgun powerup to get the shotgun.  When you have the shotgun, you do not have to be as accurate.  Some of the crates and barrels explode when you shoot them. 