かなり単純明快, just a labeled diagram of the two floors of the Castle denoting the location of Paper Pieces & Maps and the items needed to acquire each.
補遺
Just an update: technically it is possible to access the two Paper Piece treasure chests on the 2nd floor (that are closer to the center) with just a Portal + Ice Wand combination and without the Fire Sword, though it is quite tricky. Basically this involves having to carry fire with a flaming stick from elsewhere and pulling off some very quick maneuvers. In terms of labeling the map, I wouldn’t change it to reflect this though, as the way it is now would be the intended method to reach these chests.
The images were created awhile ago and the above is something that I subsequently discovered more recently while replaying the game and trying to maximize how much of it I could solve without the Fire Sword. As such a few new creative solutions came to light here and there.