Crossword puzzle clue "hard to crack puzzle"

Here are the possible solutions for hard to crack puzzle clue

Answer
Clue
Relevancy
enigma
Clue
Hard-to-crack puzzle
Hard nut to crack
Definition
(Greek) something that is difficult to understand
try
Clue
Crack or shot, but not crack shot
meta
Clue
Puzzle-within-a-puzzle puzzle
Definition
(US) concerned with cultural conventions; (of an artistic work) self-referential
acorn
Clue
Hard nut to crack?
Definition
the fruit of the oak tree
coded
Clue
Hard to crack
Definition
CODE, to convert into symbols
easyjob
Clue
Not a hard nut to crack
enigmas
Clue
Hard nuts to crack
Definition
ENIGMA, (Greek) something that is difficult to understand

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