Please try the following steps to see if any of them resolves the problem:

• Please make sure that your device meets the system requirements.  
  If your device does not meet the system requirements, the app may not start.
• Restart the app.
  Please close the app to restart the game.
• Restart your smartphone.
  Turn off your device and then turn it back on.
• Switch to a stable connection or switch from Wi-Fi to 4G/5G.
  If you are using 4G/5G, please make sure that your connection speed is not capped or throttled.
• Set the graphics to "Low" if the game starts up.
  Open the Menu in the Home screen (button with three bars in the upper right corner), select [Settings], then select [Graphics] and adjust the graphics from there.
• If you are using an Android device with a microSD inserted, check the location where the app is installed.

*If you confirm that the app is installed in the microSD, move it to your device's main storage.

For bugs and other issues, please feel free to check out List of Known Issues