Sudoku Support

trelob studio · Free, offline, no ads

Sudoku is a classic number puzzle for iPhone and iPad. It works without an internet connection, does not show ads, and does not include in-app purchases.

Requirements

iOS 14.0 or later. No account is required.

How to play

Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1–9 once. Given digits cannot be changed. Wrong entries are marked when mistake highlighting is on.

Difficulties: Easy, Normal, Hard, Expert, Master, and Extreme. Each has a built-in library of unique-solution puzzles. Use Preference on the home screen to show, hide, or reorder those cards.
Continue: An unfinished game is saved on the matching difficulty card. Recently completed games appear under Recently Played.
Undo, erase, notes, hint: Undo is unlimited. Erase clears a cell you filled. Notes let you pencil in candidates. Hint explains a standard solving step and can fill a cell; each game includes 3 hints.
Number First: Turn this on to pick a digit on the pad, then tap an empty or incorrect cell to place it. Correct cells stay locked.
Sound: Optional sound for fills, tools, and completing a puzzle. Toggle it next to Number First.

Common questions

Does the app need the internet?: No. Puzzles, hints, and saves are on your device.
Is there an account, cloud save, or leaderboard?: No. Progress stays on this device. Deleting the app deletes that data. We cannot restore it.
Why can’t I edit a number?: Clues that came with the puzzle cannot be changed. With Number First on, correctly filled cells also cannot be overwritten; empty cells and mistakes can.
A hint isn’t available.: If the grid has mistakes, fix those first. Each game has 3 hints. After that, keep solving on your own or start a new puzzle.
How do I hide a difficulty?: Tap Preference, then use the switches. At least one difficulty must stay visible.
How do I turn the sound off?: Open a game and turn off Sound below the number pad.

Contact

If these notes do not solve it, email sanchui0814@126.com with your device model, iOS version, and a short description of the issue.