About
osu! is a free-to-win rhythm game, currently known by and released under the codename "lazer" (described as "sharper than cutting-edge"). It is the future and final iteration of the osu! game client, marking the beginning of an open era. The project is under constant development, and players are encouraged to install a release alongside their stable osu! client. The website lists macOS 12+ (Intel and Apple Silicon) among the platforms with the latest release.
The project supports user-created gameplay variations called "rulesets," which let developers use the osu! beatmap library, game engine, and UX for new styles of gameplay. Templates and examples of custom rulesets are available. The source code is open and can be cloned from GitHub, with prerequisites including a desktop platform with the correct .NET SDK and a capable IDE.
The website also notes that the source code can be built and run manually if a platform is not officially supported, and that the iOS TestFlight link has a user limit and is reset occasionally.
What's new
All release notesHomebrew cask osu@tachyon 2026.1026.0-tachyon (sha256 9ab7213660c6b4bcef601d3fefd1b0a3ae38476fdbb6c23c16b88356e7aad6e6).