osu! is a rhythm game based on the gameplay of the popular Nintendo DS series Osu! Tatakae! Ouendan! and its overseas counterpart Elite Beat Agents. While trying to keep an authentic feel gameplay-wise, osu! has a wide range of online features, such as player rankings and replay exchange. Also available is a fully functional in-built editor allowing intuitive creation of your own beatmaps, and a quickly growing library of user-created content.