Looking for a certain online riddle

[Andail]

I'm not at all a fan of online riddles; in fact I've only tried a few, and only the first couple of levels. I simply don't have that kind of intelligence, or patience.

Years ago I came across one that was based on pencil-drawn backgrounds and some very obscure hints. I don't think it involved any external research, nor any of the typical adjusting-your-monitor-to-see-the-hidden-text kind of tricks.
It looked pretty intriguing, and I bookmarked it to return to it later. Although I never did, and then I lost it.

Apparently, there's been a veritable boom of online riddles lately, and after some pretty extensive googling I haven't found the one I was looking for. Instead I've come across a gazillion pretty stereotypical goth-horror-themed "adventures" with lots of random facts and math puzzles and other silly riddles.

My recollection is very vague, and all I can give you now is that it was based on drawings, and that it seemed to be set in a medieval or at least old fashioned time, and there'd be mostly a room with some minor objects and maybe some characters, among them a tortoise if I'm not mistaken.

Any bells ringing?

If not, feel free to discuss online riddles (although it's been done before) and maybe recommend a good one.