The whole 2 worlds comment never made sense, though. It only really seems to be true in cases like Sonic X or the Live Action Films. And while I've dived into Sonic X's lore before to help explain the oddities of the game's timeline, it's still a totally separate continuity and branches off wildly with the 3rd season. I'm not doubting some idea like that is vaguely in an internal document, but rather it's so vague that I can't actually figure out how it truly applies to game canon. The classic era is more or known to fit on a series of small Islands separated from the human continents and most human interaction. South Island, Westside Island, Angel Island, Flicky Island, Little Planet (not an Island, but same idea), Carnival Island (Chaotix), Mirage Island (Sonic 4)... you get the idea. Sonic only begins traveling the wider world in the Adventure/3D era. None of that clearly states there's a separate world, or was ever implied too. Generations splits off the classic 'timeline' from the regular one (leading to Mania vs Forces), but that's not supposed to be a huge divergence where one world has humans and the other doesn't. It's a split from early on in Sonic's life thanks to the events of Generations itself. So I'm skeptical of how even this "two worlds" concepts works or if it exists in a meaningful way in the games. Beyond a split timeline (which has been confirmed), it makes no sense as the 4chan leak described it. And even if it just talking about the split timeline, it's very different from how Sonic X did it (where the worlds diverged at an early point in their histories, with a time warp further distorting the flow of time between them). I would seriously question that entire post, as it seems, at best, either outright made up, or horribly out of context if it has any basis.