Mozart's canons, often written as social amusements, display his characteristic melodic grace within the framework of imitative counterpoint. They are distinctive for their surprising depth despite their small, playful dimensions.
Maintain a smooth, cantabile connection between the intervals of imitation.
Canons for 2 or 3 Voices (K.508a) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Canons for 2 or 3 Voices (K.508a) lasts about 2 minutes.
Canons for 2 or 3 Voices (K.508a) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.