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Osu!

osu!
Osu!Logo (2015).png
Developer(s) Dean Herbert
Platform(s) Microsoft Windows
Android (starting 2.1)
macOS
iOS (App Store)
Cydia
Windows Phone
Release date(s) September 16, 2007
Genre(s) Music
Mode(s) Singleplayer, Multiplayer

osu! is a freeware rhythm game developed by Dean "peppy" Herbert, originally for Microsoft Windows. It is written in C# on the .NET Framework. The game has also been ported to macOS, iOS, Android, and Windows Phone. Its gameplay is based on commercial titles including Osu! Tatakae! Ouendan, Elite Beat Agents, Taiko no Tatsujin, beatmania IIDX, O2Jam, and DJMax.

Game levels are called beatmaps. In each beatmap, a song will play and different Beats hit elements (hit circles, sliders and spinners) will appear on the play field. Players must use a pointing device to manipulate these elements in time with the playing song's rhythm in order to earn points. The use of a graphics tablet in combination with a keyboard is common in osu!, although some players do use a mouse.

There are five default difficulties which are defined through the game as Easy, Normal, Hard, Insane, and Expert (commonly known as Another or Extra). Beyond this, "Marathon" difficulty is reserved for beatmaps which are longer than 5 minutes long. "TAG" difficulties are another popular variation to the standard difficulties, intended to be played by multiple people taking turns at set intervals in the beatmap. Content creators may choose to name their difficulties to anything outside of the standard naming conventions. Usually, the oddly named difficulty is Expert.

The main objective when playing osu! is to hit, complete, and clear enough hit circles, sliders, and spinners to keep the health bar, which drains at a steady rate throughout the game, above 0 until the beatmap is over. More experienced players will often strive for a more specific and difficult goal, like improving their high score or grade on a particular beatmap, usually by attempting to time their hits better and avoid as many misses as possible to increase combo multipliers, often with mods applied as well.


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