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Open Settings › Game Center on your iPhone and sign in with your Apple ID, then reopen the game. Game Center is needed for world rankings and duels with friends; the rest of the game works without it.
Ads keep the game free. An ad may play after each level, and you can choose to watch rewarded ads for bonuses. To limit personalized ads, turn off tracking in Settings › Privacy & Security › Tracking.
Progress is stored on your device. Deleting the app removes it, and it does not transfer automatically to a new device. Leaderboard scores stay in Game Center.