Answer: bewildering

AnswerCrossword Clue
BEWILDERINGPerplexing.
BEWILDERINGExisting around author is confusing
BEWILDERINGLike a puzzle by Gene or Billy?
bewilderingCause (someone) to become perplexed and confused
bewilderingBEWILDER, to confuse (to perplex (to puzzle (to perplex)))