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All answers having "Puzzle" as clue:

3 Character Answers:

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VEX



4 Character Answers:

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DEEP

KNOT



5 Character Answers:

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ADDLE

BARRE

BEFOG

ENIGM

POSER

REBUS

STUMP



6 Character Answers:

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BAFFLE

BEMAZE

BEMUSE

ENIGMA

JIGSAW

RIDDLE

STUCCO

TEASER



7 Character Answers:

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MYSTERY

MYSTIFY

NONPLUS

PARADOX

PERPLEX



8 Character Answers:

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BEWILDER



9 Character Answers:

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BAMBOOZLE

CONUNDRUM

CROSSWORD

DUMBFOUND



11 Character Answers:

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BRAINTEASER



12 Character Answers:

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PUTINTHEDARK