I had so much trouble with the Skull Dungeon in OoA. Most of the platforms are really narrow, with lava between them so it's hard to maneuver around enemies without falling in. There were also rooms where you had to change the color of all the floor tiles without stepping on a tile twice, which proved all sorts of frustrating. And finally, the part I got stuck at was where you have to pull a lever to make the lava floor solidify and run across before it turns back into lava. For whatever reason I can't make it in time and haven't gotten further in the game because of that (and I've been trying for over a year).