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Every puzzle shows its rules before you start. The first time you open a puzzle you can try a guided round, and the hint button shows the next correct step if you get stuck. Every board can be solved: all 5,000 levels have been checked by computer.

Every board has a par: the number of moves (or mistakes, guesses or letters) a great solve takes. Match par for three stars. The results screen shows exactly what each star needed.

At midnight Eastern time (New York), for everyone everywhere. You get one try per day, and your result is posted to the Game Center leaderboard.

Sign in to Game Center in your device's Settings, then open Online in the app. Choose Play someone random or Invite a friend. Each player has 3 days to take a turn; you'll get a notification when it's yours, and a reminder before time runs out.

After 3 days without taking their turn, they forfeit. In a 2-player match the other player wins; with more players, the rest keep playing.

Online wins earn rank points: +30 for a win (plus 5 for each extra player), +15 for a shared win, 0 for not finishing last, −15 for last place and −20 for quitting. Every 100 points moves you up a division and every 300 a rank, from Bronze to Champion.

Open Settings in the app and tap Restore purchases while signed in with the same Apple account.

Close the app completely and open it again; any purchase that didn't finish is delivered then. If they still haven't arrived, email me with the date of the purchase.

Purchases are handled by Apple. Request a refund at reportaproblem.apple.com.

Make sure both devices use the same Apple account with iCloud turned on, then open the app on the new device and wait a moment. It restarts with your progress once iCloud has synced.

Yes. Turn tracking on or off in your device's Settings > Privacy & Security > Tracking. In the EU, UK and Switzerland you can also tap Settings > Privacy choices for ads in the app.

Yes, in your device's Settings > Notifications > Puzzleweight Champ.