Hard problem (15 letters) — Crossword Helper

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The Clue

Hard problem (15 letter answer)

The Answer

TOUGHNUTTOCRACK

Tags

difficult hard headache problem squirrel task toughnuttocrack

Notes

The answer TOUGHNUTTOCRACK is so rare that it appears less than once every 2500 puzzles.

Related Clues

Difficult task
Squirrel's headache?