A classic example of American ragtime literature composed by George Botsford. It is distinguished by its crisp, driving stride-influenced left hand and syncopated right-hand melodic lines.
The primary challenge is maintaining a steady, metronomic left-hand 'oom-pah' pattern.
Comparable difficulty and character — good candidates for what to learn next.
Boomerang Rag is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Boomerang Rag lasts about 3 minutes.
Boomerang Rag 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 Black and White Rag by George Botsford, Black and White by George Botsford, 12 Variations on "Ah vous dirais-je, Maman" by Wolfgang Amadeus Mozart — see the full similar-pieces list on this page.