Piano Tiles Butter BTS is a free music game available on Android developed by Evans Dev. The game is designed to challenge your concentration and reaction speed while following the melody. The objective of the game is to tap the black piano tile and avoid the white tile to finish the song. As you progress through the levels, the game gets faster, increasing the speed of your fingers.

In addition, the game offers an online and offline music player, allowing you to tap the tile while listening to the music. The game is simple, fun, and free, and it's a great way to train your concentration and reaction speed. The endless mode is also available for players to challenge themselves and see how high they can reach.

Overall, Piano Tiles Butter BTS is an enjoyable music game that offers a great challenge for players. It's perfect for music lovers who want to train their concentration and reaction speed while following the melody.