Let’s solve it.

How do you play Color Sudoku?

Fill the 9×9 board so every color appears exactly once in each row, each column, and each 3×3 box. It is classic Sudoku logic represented with nine distinct colors instead of the numbers 1 through 9.

Is Color Sudoku mathematically different from traditional number Sudoku?

No. The logic, deduction rules, and puzzle structures are identical to traditional Sudoku. Because Sudoku has never required math, arithmetic, or counting, substituting nine colors for the digits 1 through 9 preserves 100% of the authentic puzzle logic while engaging visual and spatial pattern recognition.

Is Color Sudoku easier or harder than regular Sudoku?

The underlying difficulty matches classic Sudoku across all five levels from Easy to Evil. However, many players find colors more intuitive and relaxing because they eliminate math anxiety, while advanced players find that visual scanning across the board engages spatial pattern recognition differently than reading numerals.

Can I play offline?

Yes. Color Sudoku works offline after it is installed. Games do not need an account, an internet connection, or a remote server.

Does the app save my progress?

Yes. Your current game, settings, and statistics are saved locally on your device so you can continue later. The app does not provide cloud sync.

Which difficulty levels are included?

Color Sudoku includes Easy, Medium, Hard, Expert, and Evil difficulties. You can also create a custom game.

Are notes, hints, and undo available?

Yes. Use notes to mark possibilities, request a hint when you are stuck, and undo recent moves while solving.

How do notes and pencil marks work without numbers?

When you tap the Notes button, you can place smaller candidate color dots inside an empty square. As you fill surrounding cells with confirmed colors, conflicting candidate notes automatically clear to help you narrow down your choices.

Can I play if colors are difficult to distinguish?

Yes. A symbol overlay gives every color a distinct shape, and the Contrast palette is designed for color-vision-safe differentiation. Both options can be changed in the app’s appearance settings.

Which devices are supported?

Color Sudoku is designed for iPhone and iPad running iOS 17 or later.

Can children or beginners learn Sudoku with colors?

Yes. Color Sudoku is particularly approachable for beginners and kids because there are no intimidating digits or math connotations. The basic concept of 'no duplicate colors in a row, column, or box' can be learned in seconds.

Does Color Sudoku collect any personal data or show advertisements?

No. Color Sudoku has zero third-party advertising, zero analytics trackers, and zero user data collection. Your gameplay remains completely private on your own device.

Can I customize the game rules or assists?

Yes. In custom games, you can adjust assist features like error highlighting, auto-clearing notes, selection highlights, and lives to tailor the experience to your solving style.

How should I report a bug?

Email [email protected] with what happened, what you expected, your device model, and iOS version. A screenshot and the steps that led to the problem are helpful, but never send information you consider sensitive.