Please include your device model, the app version from Settings, About, and what you were doing when the problem appeared.
Common questions
Why do I need an account? Leaderboards, the daily challenge ranking, friends and cloud sync are all tied to your account, so the game asks you to sign in with Apple, Google or email before playing.
How do I delete my account? In the app, open Settings and choose Delete Account. It removes your account and all of its data. See the deletion page for details.
Where is my progress? Progress is saved to your account. Sign in with the same method on any phone or tablet to continue.
Are there ads or purchases? No. The game is free with no ads, no in-app purchases and no subscriptions.