Board Thread:Sonic News Channel/@comment-26567650-20150601202059/@comment-477304-20150612011207

They didn't own Sega, Sega and Nintendo were big time rivals back in the 90s. Sega isn't, and never has been, part of Nintendo.

If there were any games starring Sonic on old systems such as the NES or SNES, they would've been bootlegs, which are unofficial.