is it possible.

You know on SMB stage 7-4 you take the wrong way to go you loop right. is it possible to have that in a sonic game?

 

Anything is possible, you just need to know how to do it.

 

Pretty much what Selbi said, anything's possible with the right know how, do you plan on putting this into action? (basically putting it to the test?) I'd certainly like to see someone attempt this, although not exactly special, it's kinda unique and is something not really done on a sonic game (Nor hack come to think of it), go for it, even if you have no knowledge of how to do it.

 

What you need to do is, find out Sonic's current position at a specific point. When it matches with the one you want, don't do anything and continue the level. If Sonic's position is not matching, teleport him a backwards. This is how to do it, I think.

 

A good place to start would be to look at the S&K disasm. for examples of this in the Mushroom Hill Bosses; the level loops continuosly until the boss is defeated, maybe that would help.

 

All this is is a reset of positions.