The rule has always been that Sonic or Tails alone must be used, why should that change now?
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Sonic 2
Any re-released version of this game (official or unofficial) that has been modified to create a functional change to level layouts is not allowed.
Knuckles's levels require Sonic & Knuckles to be attached.
Super forms are not allowed.
The level select code is allowed.
The only button that may be pressed when the game is paused is Start.
The debug code is not allowed.
Ring Divisions
Entering a Special Stage with Sonic or Tails is allowed (but not advised, since it resets your rings to 0). With Knuckles, it isn't.
I don't see where it says that CF. I know it says "Sonic" on the rankings, but I was under the impression that people were using Tails for that as well as both.
If using both (without controlling Tails) isn't allowed, I need to redo all my Sonic 2 rankings. If that is so, though, why didn't someone pull me up over my CN1 video? Anyway, it could use clarification.