If your game freezes and you need to force close the app here’s how to force an app to close.

1.View your open apps

Double-click the Home button to see your most recently used apps.

2.Find the app to close

Swipe right or left to find the app that you want to close.       

3.Swipe up to close

Swipe up on the app's preview to close the app.      

Hope this information was helpful.