Opsu is an open-source version of osu! written in java and it is now on the play store. You can download beatmaps from anywhere you want and play them on your phone, and even post your scores on leaderboards to compete with friends!

Opsu is published under the GNU GPL v3 licsence
The code for Opsu can be found here:
https://github.com/itdelatrisu/opsu
Opsu's fork for android is here:
https://github.com/fluddokt/opsu
Code for this app:
https://github.com/AnirudhRahul/opsu-Android
Credits for everyone who contributed their artwork to this app are here:
https://github.com/itdelatrisu/opsu/blob/master/CREDITS.md

1. Click the download button to Downloading Page.

2. For Normal APK File, you can direct download the file, or you can choose fast download the file with our Installer.

3. For Speicial file such as XAPK or BAPK, you must to choose fast download the file with our Installer.

4. When you finish the file downloading, you must allow your phone to install the file from unknown resource.

Fixed some beatmap servers that were not working
Added some more server options to download beatmaps
Added automatic bug reporting!
Reduced app size
64 bit support
Performance Improvements