I'm glad, Juniper. The same would apply for iOS, except the steps to force close the game are as follows:

Press the Home button two times quickly. You'll see previews of your recently used apps.
Swipe up on the app's preview to close it.

You might even try to clear Safari's cache, which could help. Instructions can be found here:

https://support.apple.com/en-us/HT201265