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osu! is an open source rhythm game originally created and self-published by Australian developer Dean Herbert as a freeware. 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)[5][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. The game has about 20,000 daily active users.