Known as the 'Toccata', this sonata is famous for its rapid-fire hand-crossing maneuvers that create a dazzling, virtuosic effect. It is a prime example of Scarlatti's exploration of extreme keyboard athleticism.
The primary challenge is perfecting the hand-crossing technique while maintaining a steady, driving rhythmic pulse.
Comparable difficulty and character — good candidates for what to learn next.
Keyboard Sonata in D minor (K. 141) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
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 Keyboard Sonata in D minor (K. 141) lasts about 4 minutes.
Keyboard Sonata in D minor (K. 141) 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 Keyboard Sonata in C major by Domenico Scarlatti, Keyboard Sonata in E major by Domenico Scarlatti, Fantaisie-Impromptu in C-sharp minor by Frédéric Chopin — see the full similar-pieces list on this page.