R-DRUM HD is a free Android app developed by RTR GAMES that allows users to play drums on their devices and use it as a metronome, drum, bass, and more. The app features 5-piece ring, 6-piece drum, and 1-unit bass drum.

With the metronome feature, users can play their drums without missing a beat. Additionally, there are 4 additional sounds in the app, including guitar, piano, bass, and magic, that users can use to create intro or outro.

R-DRUM HD also includes 4 sync infrastructures that offer more entertainment by allowing users to turn on and play the rhythm. For more applications by RTR GAMES, users can search for them on Google Play. Other practices include organ-electric clamping, r-r-r-reed flutes, and more.