Crossword puzzle clue "tough to solve"

Here are the possible solutions for tough to solve clue

Answer
Clue
Relevancy
hard
Clue
Tough to solve
Definition
firm and unyielding
knotty
Clue
Tough to solve
Definition
full of knots
thorny
Clue
Tough to solve
across
Clue
Solve every clue here and you won't go down
Definition
from one side to the other
add
Clue
What you must know how to do to solve a kakuro puzzle
Solve some KenKen, say
Definition
to compute the sum of
alg
Clue
"Solve for x" subj.
''Solve for x'' subj.

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