EDIT: Support for iOS9 will be discontinued in version 35.
Please note: updating to v35 will block access to the game on any additional device that is not updated.
We wanted to let you know that we are planning to end the support for iOS 9 in a future update, currently planned for early 2021.
We'd love to keep supporting older devices, but some of the 3rd party libraries we depend on have decided to drop the support for iOS 9. This change affects users of the iPhone 4S, iPad 2, iPad (3rd generation), iPad Mini (1st generation), and iPod Touch (5th generation). Please note that Apple has stopped supporting these devices in 2017.
We realize that this is a disappointment for the (small amount of) users affected, and we sincerely apologise for the inconvenience.