This puzzle is rated 4000 on chess.com and has a 100% fail rate

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This puzzle is rated 4000 on chess.com and has a 100% fail rate. Black to play and win. Can you solve it? : r/chess

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Why is this a 4000 elo rated puzzle? I solved it without help as an 800 : r/ chess

Just reached a new career-high puzzle rating of 2800+! (although it doesn'treally matter lol) : r/chessbeginners

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Is this the most confusing 300-400 rating puzzle on chess.com? : r/chess

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