- make sure you have Android 5.0 or above;
- under your phone's Settings, the Unknown sources option is checked as enabled. This will allow you to install third-party .apk files on your device;
- always download the latest .apk from the Nutaku website;
- clear Overlewd' app data, uninstall and re-download and install the latest .apk if you're having issues loading the game;
- make sure that you're logged in on the Nutaku website from your mobile phone's main browser;
- restart your mobile phone if you're having issues loading the game.