I notice that the listed name and the URL it points to are misspelled: the second "k" of "Knuckles" is omitted. Might that have anything to do with it? I don't know how the site's database links work.
I've just tried to download the manual for this Megadrive (a.k.a. Genesis) game, but when I clicked on the link to it under the "S" listing I received the message, "Error: manual not found." Can you shed any light on this, Vimm?
P. S. I'm delighted that the site lives on.