I want to change the language.

You can change the language by following the steps below:
1. Please click on the gear icon in the title screen or the ≡ icon on the upper right corner of the in-game screen to enter the options screen.
2. Select "General".
Scroll to the bottom and select "Custom" under "Language".
4. Select the checkbox for the language you want.

Please note that you can only change the display language. Even if you change the language here, the Game Center achievements and other items will still be displayed in the language you selected in your device's system settings.