From Sonic Retro
All of these pages are currently in the process of being moved to Sega Retro. Sega Retro's text replace function doesn't work right now - Sonic Retro's does, hence why the work is split between the two wikis.
Every Sonic Retro page should redirect to its Sega Retro counterpart located here.
If the developer is strictly Sonic-only (which shouldn't be the case) then I am an idiot and the page should be put back in Category:Developers (with its Sega Retro counterpart flagged down for removal).
Eventually this category should not exist.