Osu!

Click on webosu! on the top left to use if on chrome

osu! is a free-to-play rhythm game primarily developed, published, and created by Dean "peppy" Herbert, written in C# on the .NET framework. Originally released for Microsoft Windows on 16 September 2007, the game has throughout the years been ported to macOS, Linux, Android and iOS.

Click the circles, settings can change it, so forth

Have fun!