Board Thread:Questions and Answers/@comment-120883-20141128204017/@comment-477304-20150627172451

Oh yeah, as you said "everything" about Sonic and co. co-existing with humans confuses you. I'll try to explain:
 * 1) There is nothing in any of the early manuals that states Eggman is the only human in the world, so there's no reason to explicitly assume that he's the only one. I think Sonic Triple Trouble's manual says something about "Mobius" but that's an isolated incident. Besides, the STT boxart has AoStH Robotnik on it, so it makes sense to assume they were just trying to plug in on the TV series, It's not the first time, or the last.
 * 2) South Island has a modern day civilisation. Just look at Spring Yard and Star Light Zones. What do you see in the backgrounds? Tall buildings and skyscrapers. Now, these could simply be cities the anthros of South Island built, and if they did, it shows they're advanced and have a society similar to our own, so that should remove any sense of juxtaposition of nature-loving anthros and industrious humans.
 * 3) Just because you don't see any humans (other than Eggman) doesn't mean they don't exist. Would you assume that the Mushroom Kingdom is purely inhabited with hostile turtles and mushroom-things? As a very hard-working user on this wiki said: "The absence of evidence is not the evidence of absence."
 * 4) You don't seem to familiar with Occam's razor, in other words "the most simple solution is often the right one." When most people played Adventure for the first time, they probably thought "Oh hey, humans. that makes sense I guess, I mean, Robotnik's a human." Based on what you've said, your reaction was "Humans!!!!!? That's impossible! Sonic and co. must've been transported to another world. It's the only logical explanation!" Even though there's no context of such a thing happening. This is a conclusion you came to yourself, and now you're angry at Sega because they've done stuff that contradicts your own ideas. You're getting mad at people because of something you assumed. That's like hearing hooves in the distance, assuming it's a zebra when it's actually a horse, and then getting angry at the horse.

In short, there's nothing to indicate that humans don't exist in Sonic's world and you're overthinking things.