Does this count? It's in the same room as an emerald token, and anyone doing a thorough search of the map for secrets would probably find it.
Anyway, question for SSNTails, what is your opinion on the new stages, like the reworked THZ Act 2, or the new Egg Rock Core. Also, have you yourself had any thoughts ever of porting SRB2 to a new engine, like Source or anything else?
Yes, I've thought about porting SRB2 to a new engine many a time, especially since people used to constantly beat me over the head about it. I think doing so would throw the game's art direction all out of whack, and probably require massive parts of the game to be remade. Then you get stuck in 'engine test land', where nothing substantive has been made, ala Sonic GDK, and countless other 3D Sonic fan games.