osu is a freeware rhythm game with many, many user-made maps featuring plenty of popular and unpopular songs from across music history. Or in short, a lot of anime songs. I mean a LOT. The game is readily playable on PC but has yet to receive a satisfactory mobile version. This is still not that satisfactory mobile version, I'm afraid to say. Honestly, it feels like they just stuck the PC version onto mobile devices, which comes with a plethora of issues if it's not properly optimized for the smaller platform. For instance, there's a sorta functional mouse cursor that's definitely not optimal for mobile. The UI is also very busy and difficult to fit onto a tiny screen, though thankfully there's plenty of options to adjust it to varying degrees of success. Worst of all is the constant lag and crashes, obviously not good. As of now, it's definitely not worth playing this mobile version over the PC original, and I would wait for more updates to make it much more suitable for mobile.