Here’s a safe, legal, unblocked favorite:
👉 – A browser-based mania-style game with custom songs. Works on Chromebooks, no install needed, and usually not flagged by school filters.
Use a translation proxy, find a safe HTML5 clone, or try Rhythm Plus. You’ll be tapping to the beat in no time—just keep one eye on the teacher. Got a favorite unblocked osu!mania clone? Drop it in the comments (or write it on a note and pass it to your friend in class).
So what do you do? The official osu! website has a limited but functional web version of osu!mania. It doesn’t have every song, but it’s perfect for a quick rhythm session.