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1.
1. 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. It's insidious puzzlement.

2. A level or puzzle in a videogame that is extremely frustrating.

Josh: I can't figure out how to escape this room! This level is insidous puzzlement!
Definition 1.
Bob: Man, this test is hard.

Dan: Yeah, I know. It's insidious puzzlement.

Definition 2.
Josh: I can't figure out how to escape this room! This level is insidous puzzlement!
by The Anonymous Corporation April 21, 2010