I have just attempted puzzle 130404816 (ePKzI) and yes I failed to solve it but even after studying the answer I failed to see the point of the puzzle. This puzzle had only been attempted 9 times before i first attempted it several days ago.
It would be nice when tackling random problems if on conclusion the classification of the puzzle was displayed.
How do the moderators get to know if a puzzle is good or bad?
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