Strange Dream - alternative reality secret?

Hi all,

Looking at the Dream level in the editor I saw there's another altered copy of the whole world over the real one. Is there a way to get there? The copy seems to be an older version of the level, but I wish it's there for a reason.

Next to the starting area, there's a button which changes difficulty of the level between Easy and Normal. Lower world in the editor is Normal diff, while upper world is Easy

Also there are secrets in this level, all of them can be accessed only in Normal difficulty

And last thing... Try not to mess with Editor until you have finished the level. It can spoil all of the fun

Thanks for the explanation.