Make sure you are playing on a supported device. Please check the list of supported devices:
•        iOS:
o        iPhone 5S
o        iPhone SE
o        iPhone 6 and iPhone 6 Plus
o        iPhone 6S and iPhone 6S Plus
o        iPhone 7 and iPhone 7 Plus
o        iPhone 8 and iPhone 8 Plus
o        iPhone X
o        iPad Pro and iPad Pro Mini
o        iPad Air and iPad Air 2
o        iPad Mini 2, iPad Mini 3 and iPad Mini 4
•        Android:
o        The game supports Android devices with at least 2GB RAM.