Answer: brainteaser

AnswerCrossword Clue
BRAINTEASER

Challenging puzzle

BRAINTEASER

"If three hens lay three eggs in three days ...," e.g.

BRAINTEASER

It may call for lateral thinking

BRAINTEASER
Poser
BRAINTEASER
Hard puzzle
BRAINTEASERLingerie shown during a preview?
BRAINTEASERMental challenge
BRAINTEASERKnot
BRAINTEASERRiddle
BRAINTEASERDifficult puzzle