Representing the most ambitious of the set, the sixth ballade features virtuosic writing and significant emotional weight. It is musically notable for its structural complexity and the intensity of its thematic development.
Maintaining stamina for the demanding octave-runs and large chordal clusters in the climax is the primary technical hurdle.
Comparable difficulty and character — good candidates for what to learn next.
Ballata No.6 in B minor is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ballata No.6 in B minor lasts about 8 minutes.
Ballata No.6 in B minor is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Ballata No.1 in G minor by Marco Anzoletti, Ballata No.2 in B-flat minor by Marco Anzoletti, Cammino Funebre No.1 in B-flat minor by Marco Anzoletti — see the full similar-pieces list on this page.