Crossword puzzle clue "mind wrenchingly difficult as a puzzle"

Here are the possible solutions for mind wrenchingly difficult as a puzzle clue

Answer
Clue
Relevancy
craniumcrushing
Clue
Mind-wrenchingly difficult, as a puzzle
meta
Clue
Puzzle-within-a-puzzle puzzle
Definition
(US) concerned with cultural conventions; (of an artistic work) self-referential
ahardnuttocrack
Clue
Difficult puzzle, e.g.
brainteaser
Clue
Difficult puzzle
Definition
something (as a puzzle) that demands mental effort and acuity for its solution
knotty
Clue
Like a difficult puzzle
Definition
full of knots
poser
Clue
Difficult puzzle
Definition
one that poses
sky
Clue
Often-difficult part of a jigsaw puzzle
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old

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