Game Piano - Jujutsu Kaisen is a free Android app developed by Nona JeniUS in the category of multimedia, specifically music and radio. This piano game is an unofficial fan application that features piano melodies arranged with individual piano notes from the anime series Jujutsu Kaisen and Kimetsu no Yaiba. The app's disclaimer states that it is not affiliated with or endorsed by any party or record label and does not include any copyrighted material. The app is for entertainment purposes only.

The app is easy to use and has a simple interface. The gameplay is straightforward and involves tapping the piano tiles as they appear on the screen, following the rhythm of the melody. The app features different levels of difficulty and various songs to choose from, including popular anime soundtracks.