Jag vet itne om det är rätt.. men i en walkthrough hittade jag följande text om en "Skull face"... jaja.. det är långt 
"Now stand on the far left or far right side of the carpet.  I strongly 
recommend the far right side.  Make sure that you are still on the carpet 
however.  Then head up and you'll face the final boss of the game.  Since he 
looks like a skull, why not call the boss "Skull Face?"  Now his attack is to 
spit out two fireballs that explode like B-grenades.  However, his aim is 
just like every other enemy in the game.  So if you stay to one side of his 
face, you can dodge his shots.  Do not stand left or right of the red carpet 
or Skull Face will shoot diagonally at you.  Standing directly in front of 
Skull Face is obviously a suicide mission.  Before I forget, you can no 
longer use the continue code once you start fighting Skull Face.
Now if you look carefully, you should see six blocks in front of Skull Face 
that look different from the other floor tiles.  These blocks cannot be 
passed through.  This is the reason why you should stay on the right side of 
the carpet.  If you look at it, you will see that you can approach Skull Face 
from the right side without having to waste time going around the blocks.  
However, heading up via the left side of the carpet will force you to go 
around the block in your way.  Doing so will definitely cause Skull Face to 
fire diagonally at you.  It should be apparent that the black and gray 
striped lines running diagonally out from Skull Face are actually walls and 
cannot be passed through.  It is also interesting to note that you can stand 
on Skull Face himself without dying.  Only his shots can kill you.
Anyway, just get within grenade range and toss grenades at Skull Face until 
he blows up.  You need to be close enough or you'll get caught by Skull 
Face's shot explosions.  His face will start to flash red after you inflict 
enough damage.  It takes around 10-15 grenades to destroy him.  He will leave 
a gold heart behind.  Now you have two options.  You can finish the game now 
or continue playing from the beginning with your score intact.  If you want 
to win the game now, then grab the gold heart.  You will get 40,000 bonus 
points.  You should have over 500,000 points if you never continued since the 
start of the game."
Källa: 
http://www.gamefaqs.com/console/nes/file/587347/21864 
					
										
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