Rapid Fire hint file.
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1)On this level you must find the machine gun grenades and health packs.
  Try and find the health packs before you take on to many hits so that 
  you will be able to take one with you.

2)On this level you must jump down onto the lower level. Try and take out 
  the guards standing by the barrels first by shooting the barrels. Then 
  you must jump onto the highest box, grab the ammo and health packs on
  the way up. Before you reach the highest box try and make sure that you
  are at your best possible health. Once you've taking out those guys, you
  must jump off that box, down into the room below. Take out the guards.

3)On this level you must work your way around the back where you will 
  find more rocket ammo and a guard standing in front of a computer. Do
  not approach this guy until you have found a silver key. So go back the
  way you came in, keeping to your right you should now see a passage way.
  Work your way to the back and find the silver key. Now go back and 
  approach the guard. He will then warp you to the next level.

4)On this level you must find a switch that you can turn off by walking up
  to it. Doing so will open the cage door that is blocking you from getting
  to the stairs. You must watch out for the big blue guys, they hide in 
  corners waiting for you to walk by. It is better to use your machine gun
  on the blue guys.

5) This the final level. You must take out the guards. Then run up and kick 
   open the door, but be careful because there is one of those big blue
   guys standing on the other side of it. Now run up to the computer it
   will then display a massage. After you've cleared the massage a secret
   door will open up, but one of those big blue guys will be standing there
   ready to blow you away. Take him out then go up the steps and get the 
   red key. Now return to level 5 and go to the back and open the door.
   There you will meet 5 big blue guys all ready to blow you away. You
   must figure out how to take em out. Then move on to the back, there
   you will find Dr. Zork, go ahead and take em out.