well there is backtracking... and backtracking... going back to an empty area you already passed through with nothing in your way aside from a door that now you can open just going through a stage in reverse (DMC4?) that's one thing... but ''now i can access that 15% of that area i couldn't before!" or "now i can take a shortcut through this area thanks to this powerup!'' it's another.
Symphony of the night is pretty good with this. Enemies are always there for you but you always get new itens and powers to make you reach a bit further and going back-to-back in the castle. And by the time you are REALLY powerful, it just inverts the castle. Making you essentiall backtrack the whole thing with a twist that makes it ''new'' again.
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