The subject refers to a specific iteration of a popular mobile rhythm-based platformer available on the Android operating system. The term “APK” signifies Android Package Kit, the file format used to distribute and install applications on Android devices. The number “2.1” designates the version of the game.
This particular release held significance for players due to the introduction of new levels, gameplay features, and cosmetic items. Its availability on Android provided accessibility to a wide user base, contributing to the game’s overall popularity and longevity. The release also fostered a community centered around level creation and sharing.