Does anyone know what to do on this especially the Dark Nuts how do you get past 2 of them let alone 3 of them? Has anyone even finished the 50 floors??

It's not really that difficult.
Just be sure that you ahev as many Heart Containers as possible (preferably all 20), the Magic Armour, lots of Rupees, and all of the bottles filled with Blue Potions, Great Fairies Tears or Rare Chu Jelly.
As for defeating the Dark Nuts, just dodge their attacks and do lots of back slices and helm splitters.

I got to about floor 48. So close!

I have done it with 3 Blue potions. It's quite difficult.

What you should have:
- 19 or 20 heart containers,
- All items,
- All bottles (3 or 4 with Blue Potions),
- Giant Wallet,
- Giant Quiver,
- All 7 hidden skills,
- A full Slingshot in case you run out of arrows.
- Magic Armour,

Tips:
- Save your Magic Armour for fights with 2+ Darknuts.
- NEVER pick up Purple Chu Jelly. The effects are random.

Strategys:
(THIS IS FOR ONE OF THE ENEMY)

Darknut: Z-target him and Jump attack. Before he lowers his shield, do the Shield attack followed by a helm splitter. Land in 3 quick blows to his back. When he throws his sword, jump to the side. Then do some nice Back Slice's.

Flying thing (Sky City miniboss): Shoot an arrow at him, quickly Z-target and grab him with your Clawshot. Land in some swings and Great Spins.

Redead Knight: Jump Strike = 1HKO.