Support
Cube Sudoku is a 3D Sudoku game for iPhone and iPad. You can play offline. No account in the app is required.
Help: hints and error checking now sit together behind the question mark. On Easy, error checking is on from the start.
Pause: your game waits when you come back, and the clock runs again once you resume.
Contact
Email: patrick@dream-factory.app
Please include your device model, iOS version, and a short description of what you expected versus what happened.
Publisher: Dream Factory (Patrick Schibli), Uster, Switzerland
Website: https://www.dream-factory.app
What is free
You can try the core game without paying:
- the interactive tutorial
- Daily Cube (Easy, the same puzzle worldwide)
- undo, redo, notes, timer, and error checking
- Five starter puzzles in free play on Easy, Medium or Hard. After that, another free puzzle becomes available 48 hours after you started your most recent free puzzle. At most one additional puzzle is available at a time; waiting longer does not build up a larger allowance. Daily puzzles do not use this allowance or reset the waiting period.
- Three new explained hint steps per puzzle. Reopening a previously shown step does not use another free hint. Assistance in Daily Cube can add time penalties, as explained in the daily scoring section.
- the compact statistics overview
- VoiceOver, Dynamic Type, and Reduce Motion
Full version
A single non-consumable purchase unlocks:
- unlimited new puzzles
- Expert and Master
- Daily Cube on Medium and Hard
- unlimited explained hints
- detailed statistics
There is no subscription and no advertising. Family Sharing is supported.
Restore purchases
On a new device or after reinstalling, open the game menu, choose New game, then Expert or Master. That opens the full version. Tap Restore Purchases. Sign in with the Apple ID that made the purchase. Family members can use Family Sharing if the organizer enabled it for the purchase.
Ask to Buy
If a family member’s purchase is pending, approve it in the organizer’s Ask to Buy prompt. The app picks up the unlock from App Store transaction updates — you do not need to buy again.
Daily Cube and Game Center
Each UTC day has three Daily Cubes: Easy is free, while Medium and Hard are part of the full version. Each puzzle is generated on device from the UTC date and can be resumed independently. Game Center sign-in is optional and never blocks play. If you are signed in, the app can submit each solved Daily Cube’s ranked time to its matching Easy, Medium, or Hard leaderboard and report achievements.
Game Center is optional. You can keep playing without signing in or connecting to the internet, and completed puzzles remain in your local history. Eligible daily results are queued for submission. After a later sign-in or another submission attempt with a connection, they may still be submitted on the same UTC day. After the UTC day changes, results from the previous day are not submitted to the new day’s leaderboard.
Version 1.2 uses separate leaderboards for its new assistance scoring rules. Older saved games without a complete record of assistance can still be played and saved locally, but they do not receive a score on these new leaderboards. A missing rank after updating therefore does not necessarily mean your game was lost.
Daily scoring and assistance
In Daily Cube, your ranked time is your active playing time plus time penalties for assistance. An incorrect entry alone does not add a penalty unless error checking reveals it. These penalties add seconds to your score; they are not monetary charges. Assistance does not add time penalties in free play.
| Daily difficulty | New hint step | First activation of error checking | Newly revealed incorrect value |
|---|---|---|---|
| Easy | +30 seconds | +0 seconds | +30 seconds |
| Medium | +45 seconds | +180 seconds | +45 seconds |
| Hard | +60 seconds | +240 seconds | +60 seconds |
On Easy, error checking is enabled at the start. There is no activation penalty, but newly revealed incorrect values still add time. On Medium and Hard, error checking starts disabled. Its first activation requires confirmation and may reveal existing incorrect values in addition to adding the activation penalty.
Reopening a previously shown hint step does not add time again. The same incorrect value in the same cell does not add time twice; a different incorrect value in that cell can add another penalty. Turning checking off, using Undo or reloading does not remove time already added. The full version increases the hint allowance but does not change these scoring rules.
iCloud
iCloud reconciles your completed puzzle history across your devices. If several results belong to the same daily puzzle, ranked times are compared directly only when the same scoring rules apply. In that case, the result with the better ranked time is kept. If the scoring rules differ, the result using the newer rules takes precedence, even if its time is higher.
Version 1.2 can read older iCloud results. Results from version 1.2 are stored separately and are not visible to earlier app versions. Update Cube Sudoku on all your devices. iCloud syncs completed results; it does not resume a game in progress with its notes on another device.
Accessibility
- VoiceOver describes faces, shared edge and corner cells, and the number pad.
- Reduce Motion keeps snap and celebration feedback without unnecessary movement.
- Dynamic Type scales the controls. Very large accessibility sizes are supported; if a control is clipped on a small phone in landscape, rotate to portrait.
Common questions
The cube feels slow at first launch.
The first time you open Cube Sudoku, the device prepares the 3D view. After that, the cube starts faster.
I lost my current game.
Free play and the Daily Cube are separate sessions. Use the menu to jump back to the other mode; each side is saved on its own.
A hint or new game asks me to pay.
The free version includes five starter puzzles on Easy, Medium or Hard. After that, you can start another free puzzle 48 hours after starting your most recent free puzzle; additional puzzles do not accumulate. Starting another puzzle before then requires the full version. The full version also unlocks Expert and Master, Medium and Hard daily puzzles, more than three new explained hint steps per puzzle, and detailed statistics. You can reopen previously shown hint steps without using the hint allowance again. The Easy daily puzzle remains free and independent of the free-play allowance. The full version does not remove time penalties for assistance in Daily Cube.
The purchase does not appear.
Use Restore Purchases, confirm you are on the same Apple ID, and check Screen Time / Ask to Buy. Then contact support with the approximate purchase date.
How do I redeem a code?
In the App Store, tap your profile picture, then Redeem Gift Card or Code. Or open the link you received. The next time you open Cube Sudoku, the full version is active.
How can I rate Cube Sudoku or send feedback?
Rate the app in the App Store: https://apps.apple.com/app/id6790467728?action=write-review. For a message, write to patrick@dream-factory.app.
Requirements
iPhone and iPad with iOS/iPadOS 26.4 or later. Also compatible with Apple-silicon Macs running macOS 26.4 or later.