When Günter Henle founded the eponymous editions in 1948, he published the two volumes of Piano Sonatas by Mozart. Even today, these sonatas carry the edition numbers HN 1 and HN 2. The two volumes have of course been reworked several times over the past decades, so that the score we are presenting is in good condition current musicological research. Most of the sonatas exist in the form of an autograph manuscript, and some of them were touched up by the author shortly before their publication, which is why they are published in two versions. The editor's preface and critical device contain detailed information about the sources and the musical text.