Insidious puzzlement
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A seemingly impossible to solve problem that no one seems to know the answer to
Bob: Man, this test is hard.
Dan: Yeah, I know. Its [insidious puzzlement].A level or [puzzle] in a videogame that is extremely frustrating.
Josh: I cant figure out how to escape this room! This level is insidous [puzzlement]!
Insidious puzzlement meaning & definition 1 of Insidious puzzlement.