Please make sure you have the following prerequisites: You can see some examples of custom rulesets by visiting the custom ruleset directory. To get started working on a ruleset, we have some templates available here. Building one of these allows a developer to harness the power of osu! for their own game style. Osu! is designed to have extensible modular gameplay modes, called 'rulesets'. If your platform is not listed above, there is still a chance you can manually build it by following the instructions below. Check back regularly for link resets or follow peppy on twitter for announcements of link resets. We reset it occasionally when this happens.

The iOS testflight link may fill up (Apple has a hard limit of 10,000 users).

Handy links below will download the latest version for your operating system of choice: If you are looking to install or test osu! without setting up a development environment, you can consume our binary releases.

Read peppy's blog post exploring where the project is currently and the roadmap going forward.

You can learn more about our approach to project management.

Detailed release changelogs are available on the official osu! site.

A few resources are available as starting points to getting involved and understanding the project: Feature requests are also welcome, but understand that our focus is on completing the game to feature parity before adding new features. We are accepting bug reports (please report with as much detail as possible and follow the existing issue templates). We are not yet open to heated discussion over game mechanics and will not be using github as a forum for such discussions just yet.

If this offends you, please consider sticking to the stable releases of osu! (found on the website). This is done in order to allow us to move forward as developers and designers more efficiently. Game balance and final quality-of-life passes come at the end of development, preceded by experimentation and changes which may potentially reduce playability or usability. IMPORTANT: Gameplay mechanics (and other features which you may have come to know and love) are in a constant state of flux.

It will continue to evolve to the point of eventually replacing the existing stable client as an update. Users are encouraged to try it out and keep it installed alongside the stable osu! client. This project is under heavy development, but is in a stable state. The future of osu! and the beginning of an open era! Currently known by and released under the release codename ' lazer'.

Download osu mobile