Idea for (non-sucky) Sonic Generations type game.
This game would be 16-bit 2D (either Sonic CD style or Sonic 3 Knuckles style, but I'm leaning toward the latter.) And it would remake levels from throughout Sonic's history in 16-bit style. There would be only one Sonic and minimal or no story.
It would have a branching path system just like Darius Gaiden. (if you haven't played it, think Shadow the hedgehog) But maybe also a way to cheat the path system at certain points, such as by giving up an extra life. (assuming the game uses a lives system.)
Despite the point of the game being to remake Sonic's history in 16-bit, there might be changes like a homing attack, a speed cap, and possibly other things.
Because of the branching path system, there would either be exactly 21 stages (6 per playthrough) or exactly 28 (for 7 stages per playthrough)
The problem with making this a list is that I can't list games twice. Sonic CD will have two levels as well Sonic Unleashed. So the list has only 19 entries.