Grognak - glad to have helped
Knives / Nitefly - never played Dynamite Headdy, so I'll have a nose on Youtube to see if anyone has done a recording of it. (will look for Probotector as well while I'm at it!)
I got the SNES Super Probotector for my 10th birthday back in 1992. At that age I could complete the game on the hardest difficulty and thought nothing of it. 20 years later I cant get past level 4 on easy.