Tap Download APK above and save the file to your phone.
If your phone asks, allow installing from this source (first install only).
Finish the install and open the game; on first start the game files (about 1.4 GB) download, then the login screen appears.
Log in with your site account. When a new version is out, the game offers to download and install it.
Android 8.0 or newer · 4 GB free space · Wi-Fi recommended for the first download
Installing from Google Play (closed test)
Join the test group with the Google account your phone's Play Store uses. Join the Group
Then tap Become a Tester and install the game from Google Play on the page that opens. Become a Tester
Open the game; the game files download on first start. Then log in with your site account. Play Store takes care of updates.
If the APK version is installed, you do not need to remove it; the Google Play version installs as a separate app. After you become a tester, it may take a few minutes for the game to appear in Play Store.
Installing on iPhone & iPad
Install Apple's free TestFlight app from the App Store.
On your iPhone, tap Open in TestFlight above and accept the invitation. No code is needed; if TestFlight asks for one, close it and tap this button again.
In TestFlight, tap Install next to Old2 Mobile.
Open the game; the game files download on first start (Wi-Fi recommended). Then log in with your site account.
No account yet?You enter the game with your site account. It is free and takes seconds.