link to the past how to get in room

[uudens]

i love this game, i have completed it at least 6 times, but i can never figure out how to get in this one room - dark world, last dungeon (ganons tower), floor 3F, when you go to the top right room, there is a sort of a bridge and then at the end you can go north in a stairs but south there is a crack in the wall. does anyone have any idea how to get to it? how to get in the room? i tried searching on the top floors for a way to drop in there somehow, couldnt find anything, but there is a room, its in the map! if anyone could help, would be sick! thanks