To keep track of your high scores, tap the columns icon in the top left corner of the main screen.
To get access to a leaderboard, you need to be signed in to Game Center on your iOS device:
- Open Settings on your device.
- Scroll to Game Center, then tap it.
- If Game Center isn't on, turn it on.
- Enter your Apple ID and your password.
- Your account screen will appear, where you can change your nickname, personalize your profile picture, and add your friends.