Unhundred % is a mostly vanilla hack in which the player starts with every item in the game and must place every item back in its original position! This means you get weaker as you go. There have been minimal changes to the map.

As you can imagine it's fairly easy to softlock yourself if you don't think ahead so extensive knowledge of the game is required.

Let me know what you think! All feedback is welcome!

Changes to the base game:
Start with all items
Picking up an item removes it from the Samus
Returning to the ship with no items ends the game
Morph will not appear until all other items have been removed
Door to G4 has been removed as Torian is no longer necessary
Acid Torizo no longer requires space jump to access Lower Norfair
Old mother brain room no longer locks the player in when in it's inactive state

If you are in Retro Brinstar when you deposit your last item (apart from morph) You will have to travel up the elevator and back down again to make morph appear.

Special Thanks to PJ for showing me the ropes.
Also to PHOSPHOTiDYL for creating the "Skip Intro Saves" ASM that is used.