Incorrect. At that juncture, it's no longer a puzzle. It's not longer a puzzle, at that juncture. A puzzle, no matter how difficult it might be to determine, always has a solution. It must. A puzzle without a solution isn't anything worth considering. It's a construct or abstract without rhyme or reason, chaos without order, a pointless waste of time. It's also quite possibly very messy. All the more reason not to think about it.
NEEEEEEEEEEEEEEERD ALERT
At that juncture, it's no longer a puzzle.
It's not longer a puzzle, at that juncture.
A puzzle, no matter how difficult it might be to determine, always has a solution.
It must.
A puzzle without a solution isn't anything worth considering.
It's a construct or abstract without rhyme or reason, chaos without order, a pointless waste of time.
It's also quite possibly very messy.
All the more reason not to think about it.