Chrome OS supports Android apps. If your school hasn't disabled the Google Play Store, you can download the official mobile version of the game.
Web versions like osugame.online or Web osu!mania are generally impressive but suffer from input lag and occasional frame drops, especially on lower-end hardware. osu unblocked chromebook
If Methods 1 and 2 are blocked, you can stream the game from your home PC to your Chromebook. Chrome OS supports Android apps
When you search "osu unblocked Chromebook," you will find third-party websites offering "osu!.zip" or "osu! web player." osu unblocked chromebook