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Hidden Cubes: every cube spins but one. Find it and tap it before the time runs out. A wrong tap ends the game.

Arcade: cubes twist and settle. Tap a cube the moment it is solved. Tap one that is still mixed and the game ends. Slide your finger to catch several solved cubes in a row.

To see the tutorial again, open Settings (the sliders icon on the home screen) › How to Play.

Every day at 00:00 UTC. It is the same challenge for everyone, and you get one try. Past challenges are in Challenges: the last 7 days are free to replay, older ones come with the Ruby Pass.

Classic and Magma are free. Several worlds unlock by playing, and the optional Ruby Pass unlocks all 32.

Make sure you are signed in to Game Center (iPhone Settings › Game Center). Leaderboards only count today's challenge, not past ones. If you just finished, give it a minute and reopen the leaderboard.

Sign out of Game Center and back in (iPhone Settings › Game Center), then reopen Ruby Puzzle. This refreshes the list on your device.

Open Settings (the sliders icon on the home screen) › Restore Purchases, signed in with the Apple Account you used to buy it.

Only when you choose one, for example to continue a game. There are no banners and no ads that interrupt play. With the Ruby Pass, Continue is free, without ads.

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

Check that your iPhone is not in Silent mode, that the volume is up, and that Settings › Sound Effects is on in Ruby Puzzle. Each world has its own ambient sound. Ruby Puzzle is best with headphones.

Sign in with the same Apple Account and keep iCloud on. Your progress follows you automatically.

In Ruby Puzzle, Settings › Challenge Reminder.

Settings › Reset All Progress. This clears your records, streak and unlocked worlds on all your devices. A Ruby Pass you bought is never lost: use Restore Purchases.