osu!

osu!
Original authorDean Lewis "peppy" Herbert
Developerosu! development team
Initial releaseSeptember 16, 2007 (2007-09-16)
Written inC#
MiddlewareOpenTK
Operating systemMicrosoft Windows
macOS
Linux
Android
iOS
Available in37 languages
List of languages
Arabic, Belarusian, Bulgarian, Catalan, Czech, Danish, English, German, Greek, Spanish, Finnish, Filipino, French, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Lithuanian, Dutch, Norwegian, Polish, Portuguese, Brazilian Portuguese, Romanian, Russian, Slovak, Slovenian, Serbian, Swedish, Thai, Turkish, Ukrainian, Vietnamese, Chinese, Traditional Chinese
TypeRhythm game
LicenseFreeware (stable build)
MIT (osu!lazer code)
CC BY-NC (osu!lazer assets)
Websiteosu.ppy.sh 
Repositorygithub.com/ppy/osu

Osu! (stylized as osu!) is a freeware rhythm game originally created and self-published by Australian developer Dean Herbert. It was released for Microsoft Windows on 16 September 2007, with later ports to macOS, Linux, Android and iOS.

The gameplay of osu! is based on the Osu! Tatakae! Ouendan series of rhythm games, which primarily involves clicking notes, which appear as circles, using a cursor or finger. Since the game's release, three other official "rulesets" (game modes)[1:38] have been added, taking inspiration from various games. Unlike many rhythm games, levels in osu! are created and uploaded by users, increasing the range and volume of the song library, which is a factor contributing to the game's popularity. The game has about 20,000 daily active users.

The game has a significant connection to Japanese culture and anime music. It has also had effects on the Esports industry—professional gamers use osu! as an aim trainer to warm up and practice, and the community frequently organizes tournaments between players.