For those who passed it:
I finished the first three episodes (including all the secret levels), and now I'm playing the last one. I was stuck in the game only once before (beginning 2nd level, ep3, before I found out by accident that throwing dynamite over the fence actually does something
), and I didn't really expect to be stuck again. But....
Forgot exaclty which level it is. It's full of lava, and in the middle of that is a huge hose with a wrecked roof. Now, I searched everything around it, passed all the passages that surround the house (including the secret one (with the two teleporters)), I eventually came to othe top of the house. And to my huge suprise there was a skull key door. Not having found the key yet I was a bit confused. A big chunk of the wall right next to the door was missing, so I tried throwing dynamite at that, but it wouldn't break. Searched around the rest of that room, and found the elevator shaft (leads back to the bottom of the house/tower), and a skull (not the key, a "drawing" of the skull). I "opened" it and it "grinned", and I expected at least the elevator to come, but nothing happened.
Did I miss anything? Where is the skull key ? What does the skull button do ?