Etude Op. 25 No. 9 is the 204th stage in Piano Tiles 2. It is unlocked at Level 69. It also has the nickname "Butterfly". It is quite a short etude both in Piano Tiles 2 and in real life, too! Nearly the entire composition is included except for coda. Getting three crowns is quite a challenge though, as it only has two holding tiles at the end, which indicates that endurance is needed.