Usually, by default on mobile devices, apps are minimised and run in the background when returning to the home screen, to fully exit the game follow the steps below.
There are 2 ways to close your iOS apps depending on the device model you're using.
If your device has buttons
- Double click the home button
- Swipe Gems of War off the screen
If your device doesn't have buttons
- Swipe up from the bottom of the screen and hold the screen
- Swipe up on Gems of War