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Swipe to slide the gray square one cell. Wherever it lands, it trades the color it is carrying for the color already there — the very first move just picks a color up. Match every marked cell to its target color and the level is done.

The game page has a small board you can play in the browser. In the game, the ? button at the top of every screen opens How to play.

You never have to clear a board to get past it. A key opens any locked board whose left or upper neighbor is already open, so a board you cannot crack never blocks the rest — come back to it later.

Each of the seven patterns is also its own run of 49 boards, so you can switch shapes at any time from the pattern list.

Par is the fewest moves the level can possibly be solved in, computed by a solver before the level shipped. The move budget is the point past which a clear no longer counts. The meter under the board shows how many moves are left before par, when you are on it, and when the budget has run out.

Clear a level in par and its tile on the level list turns gold. Your save keeps your best run, not your last, so a sloppy replay can never cost you a record.

Open Settings (the gear at the top of the screen) or How to play, and turn on:

• Colorblind symbols — every color also carries a distinct shape, on tiles, on your square and in the goal map.
• Outline goal cells — rings the cells still to fill and badges the ones already right.

Both take effect immediately, even mid-level.

By playing: a clear earns one key, a clear in par earns two. You start with three. If you run dry, key packs are for sale in the game's shop — the game's only purchase. Keys you buy and keys you earn are the same keys.

Close the game and open it again while you're online. A purchase the game has not finished delivering stays open with the store and is granted on the next launch.

If the purchase needs approval — Ask to Buy on iOS, or a family manager on Google Play — the keys arrive once it is approved.

Still missing? Write to us with the order number from your receipt.

Payments are handled entirely by Apple or Google, and so are refunds. On iPhone and iPad, use reportaproblem.apple.com. On Android, open your order history in Google Play, or see Google Play's refund help.

iPhone and iPad: sign into the same Apple Account with iCloud on, and your progress restores through iCloud. There is no separate sign-in.

Android: sign in to Google Play Games when the game asks, on both devices, with the same Google account.

When a device and the cloud disagree they are merged rather than overwritten: unlocked levels combine, the better move count is kept, and a spend on one device cannot come back as extra keys on another.

Give it a few seconds after launch — the cloud copy arrives after the first screen has drawn, and the screens update when it lands. Check that you are online and signed in (iCloud on iOS, Google Play Games on Android).

Progress is saved locally first, so if you never signed in to a cloud backup, it lived only on the old install.

No. There is no account, and the game is fully playable offline. The network is only used for cloud save and purchases (and, on Android, the optional Play Games sign-in).

Everything lives on your device and in your own iCloud or Play Games storage — we hold no copy. The privacy policy lists the exact steps for each.