What is the hardest Chopin scherzo?

The hardest Chopin scherzo is Scherzo No. 2 in B-flat minor, Op. 31. It is considered one of the most technically demanding pieces in the piano repertoire, and is often performed by concert pianists as a showpiece. The scherzo is characterized by its fast tempos, intricate passagework, and powerful climaxes. It requires a high level of technical skill and endurance from the performer, and is a challenging piece to master.