Hi!
I think I've found something that has been hidden for 23 years.
The other day I left the game running while adjusting my CRT TV settings and when I reach the section with two opposing spiderwebs, there was this extra life icon I've never seen before.
Today I decided to check how it happened and I realized it was there to be revealed after you meditated. You need to be in the upper portion of that room to be able to trigger it but not necessarily seeing the object appears as I was; however, I think the way I recorded it is the way it was intended to be revealed.
I've tested and confirmed that it also works in the 32X and Jaguar versions. I couldn't test the Windows 95 PC version but I suppose it works there since it uses the same source code base.
The Sega CD version never triggers this secret since the meditation idle animation is cut in this stage (they're stage-dependent in the Sega CD version) due to RAM constraints.
The SNES version simply doesn't have it (it shows the meditation sequence but never reveals anything) and it's not a surprise since it's a messy adaptation of the original Genesis/Sega CD/PC version.
For years I've read and watched everything about this game; and even in the most complete guides and playthroughs I've never seen this secret been mentioned and much less showed. So I think it's the first time ever it has been revealed.