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All answers having "Puzzling" as clue:

3 Character Answers:

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ODD



4 Character Answers:

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HARD

KOAN



6 Character Answers:

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KNOTTY



7 Character Answers:

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CRYPTIC

ELUSORY



8 Character Answers:

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ESOTERIC



9 Character Answers:

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CONFUSING

ENIGMATIC



11 Character Answers:

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ENIGMATICAL