Step 1: Step 1
Most people who have iphones have more than one game. I could help you get to know your memory and help you get more games. So first you go to settings.
Step 2: Step2
Go under general and press usage
Step 3: Step3
As the final step your phone will organize your games from most bytes used to least bytes used. At the top of the page you will see how much memory was used and how much is left
For example I will delete call of mini brawlers by tapping on it and pressing delete saving me 100 megabytes.
This is the easiest way I know to see what your problem and delete your most space-taking app and hopefully you could get more games