nil is a difficulty that is below Error and above Unreal in the difficulty chart represented by the color black with a gray [94, 94, 98] outline, just like Unreal or Horrific. It was only created to be the difficulty of Citadel of Void, one of the hardest towers to EVER be in JToH.

nil is a Low Class Peak Reality or Class 15 tower, currently standing at Hardest in the Room difficulty. It has an indeterminable amount of floors. There are only three floors of the "tower" that are visible.

It includes the canon difficulties and classes to group the difficulties that are in a similar difficulty range together, which goes from easiest to hardest in order, with the easier ones in the lower classes and the logically impossible ones being in the higher classes.

nil is a removed difficulty in EToH that is represented with the color gray. This difficulty is the hardest difficulty that exists, aside from TooHard, which is generally not considered a difficulty. It is currently debated on whether or not this difficulty is humanly possible.

CoV is a well-known nil difficulty citadel, [b] with a 10-floor ascension section, 4-floor sideways progression, and concluding with an 8-floor descension section. The current version of CoV can be played in its own place here , and the original Tower of Void can be played here .

Nil, Zero, Zilch, or NZZ for short is a WHY difficulty half-ascension/descension based obelisk in TA-IT. You should attempt this as your final tower in TA-IT. It is currently not finished. This tower has 5 steeples which are needed to progress at some point, each being at 5 floors.

Currently two difficulties in this class originated from JToH, being Nil and Why. Another thing is that jumps in this class aren't impossible, the towers are, one obstacle of this class is already extreme enough, but including dozens of them is what makes the tower truly humanly impossible.

Gita-Nil; Metaful Difficulty; The Powerful Difficulty; Infinite Un-Rebirth Meta-Gita-Teta-Peta-Exta-Zeta-Yota-Difficulty; Felix The Final Difficulty [Legendary Felix Chain Difficulty] Gita-Toohard; Ifinite-Alpha-Hard-Ultra-Mega-Impossible-Ifinite-Ifinite-True-Hardness-Never-Beating-Ifinite-Null;

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The Human Limit (THL), originally known as Zilch, is an official sub-difficulty in Class 3 or in Alternate Difficulty Chart standards, it is a Peak-Class 3 sub-difficulty, located in-between Anguish & nil. Any tower designed to be humanly-impossible or just beyond this, will be placed in nil or...