b2t, I have prepared three examples of different sledge bro maps. They can raise or lower the difficulty of a sledge fight, for sure.
After all i think the "utopean" solution would be to have some sort of level select screen for the sledge brother fights.
Anyways, here are the three maps i prepared, they all represent old Mario locations.
Sledge Brother: Dungeon:Download
This one is without a doubt a sledge-bro friendly replica of the old Mario bros games.
I thought that the koopas, which run around during the battle, can be seen as shellcreepers, so that's what gave me the idea.
Bomb Brother: Hill:Download
Well, the yellow sledge bro fight is some sort of Mouser battle, so why not having the mouser boss room for it?
Fire Brother: Volcano:Download
no explanation needed, i suppose.
those are my suggestions for further sledge bros maps. Again, a level select screen for that mode, featuring the maps of a certain folder only might even erase the questions which ones to put in and which ones not
Hope you like em, folks