osu! is a free-to-play rhythm game developed by Dean “peppy” Herbert. The objective of the game is to click or tap circles that appear on the screen in time with the music. osu! has a large and active community, with over 15 million registered players.
The game has been praised for its challenging gameplay, wide variety of music, and active community. osu! has also been used as a tool for education, with some schools using it to teach students about rhythm and music theory.