I was just thinking, since the Sonic Origins collection will be adding new features/content, what if they made Knuckles playable in Sonic CD and/or Sonic 1? Personally, I think it would be pretty cool. It would make Knuckles playable in each of the classic Sonic games and atone for not making Sonic 1 compatible with lock-on back in the day while giving people new ways to play them and an added incentive to buy Origins (which I'll already be buying anyways, probably for Switch since that's what I have Sonic Mania and Team Sonic Racing on). It would be weird seeing Amy chasing Knuckles in Sonic CD, though, unless they replaced her with Rouge or just took her out of Knuckles' playthrough altogether, which sounds more likely. They'd also have to find a way to add Knuckles into the opening and end cutscenes.