You should make an Impa's Ways walk through, that place is SO much hard than Nabooru's Hole.
There are a few places in the original hack I can't get to/do. Is there any way to drain the water, is it just there and you can't do anything with it, or do you drain it after you gotten all the Tablets, if you know what I mean

? And I still can't find out how to get to that one chest in the Parallel Tower surrounded by blue blocks, I have to be missing something very small as I have done the optional puzzle. I also can't find the magical boomerang or the shovel. Does the thieves hide out in the Parallel have any purpose?
On an other note, why do I have 20 hearts but still have 1 extra piece of heart???