Optional, unique area and/ or boss for beating Arcade in the final

Slit08

Green Slime
Hey there.
So that' a pretty long thread title, but it basically says it all.

So I had this idea that the player should be rewarded for beating Arcade Mode or well for beating te final floor (which will probably take place in the final dungeon of Story Mode).
So my idea was that in case someone manages to survive all these floors he would reach a last set of floors (two more floors basically) that is completely original and unique for Arcade Mode.
A new environment, a few new enemies, new challenges and of course 1 or 2 unqiue bosses.
I think experiencing something completely new would be a very rewarding price for getting this far into Arcade Mode.
 
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