Support
Something not working, or an answer not here? Email support@clackgame.app and a person will reply.
How do you play Shut the Box?
Nine tiles numbered 1 to 9 stand up in the box. Roll two dice, then fold down any tiles that add up to the roll — one tile or several. Keep going until every tile is down, which shuts the box and wins, or until you roll a number that nothing left up can make. Then your score is the tiles still up, added together, and lower is better. Clack also has a twelve-tile box, for a longer game.
What is the single-die rule?
Once the tiles still up add up to 6 or less, you may roll one die instead of two. It is a choice, never forced: Clack’s solver finds that one die is never the worse roll wherever it is offered, but the choice stays yours, and Coach shows what each is worth. The rule is on in the classic box; turn it off under New box, “One die when 6 or less is up”.
What does Coach do?
It shows the chance of shutting the box from where you stand, worked out exactly: under each roll button before you roll, and for the tiles in your hand as you pick them — with the best cover’s figure beside it when yours is not the best. Coach is on in practice and pass and play until you turn it off, and it never appears in the daily.
Can I take a cover back?
No — a cover is a move, as it is on a wooden box. Until you tap Cover, though, nothing is final: tap a tile again to lift it back out of your hand. After the round, the review goes through every decision you made.
When does the daily box change?
At midnight UTC, for everyone at once — midnight in London in winter, 1am in summer — and the app counts down to the next one. Everyone gets the same box and the same dice, and you get three attempts, each with the same dice in the same order.
How does the daily leaderboard work?
It is Apple’s Game Center. If you are signed in to Game Center on your device, each finished daily attempt’s score is submitted, Game Center keeps your best, and the lowest score ranks highest — a shut box scores 0. An attempt finished after midnight UTC is not submitted, because that day’s board has closed. Not signed in, the daily works just the same; you are simply not on the board.
My streak went back to one. Why?
The streak counts consecutive UTC days on which you finished at least one daily attempt. Miss a day and it starts again.
I deleted Clack. Do I have to pay again?
No. Clack is £3.99, paid once, and it stays yours: download it again from your purchases in the App Store, free, on any iPhone or iPad signed in to the same Apple Account. Your records live on the device, though, so a fresh install starts with a fresh streak and personal best.
Does it work offline?
Everything except the leaderboard. The game, Coach, the review and the daily dice are all worked out on your device; only Game Center needs a connection to take your daily score.
What do I need to run it?
An iPhone or iPad with iOS 26.0 or iPadOS 26.0, or later.