osu! is a free-to-play online rhythm game
osu! gameplay is based on a variety of popular commercial rhythm games. While keeping some authentic elements, osu! adds huge customisation via skins/beatmaps/storyboarding, online rankings, multiplayer and boasts a community with over 100,000 active users! Play the way you want to play, with your own music, and share your creations with others.
Frist Steps youtube.com/watch?v=cHAhWr6QJnI
Random map youtube.com/watch?v=Htp6d-T5GfU&feature=related
