In order to force stop the game:
Access the ‘Settings’ menu.
Select ‘Apps’, then locate and select the game in the ‘Downloaded’ tab.
Select ‘Force Stop’.
If your game continues to crash or fails to connect and you require further assistance, please access Google Android Support here.
Please note that there are many different Android devices out there with different UI/settings menus and formats. Procedures and visuals may be different depending on the type of the device and the OS.