🧩📢 Announcing the 'Puzzle XL' Contest! 📢🧩

Get ready for an exciting challenge starting on June 23!
🔹 Contest Details:
The 'Puzzle XL' contest features 13 XL puzzles, each presented on larger grids than our regular daily puzzles.
While these puzzles are bigger, they aren't necessarily harder – just more expansive!
🔹 Daily Puzzles:
Every day, a new XL puzzle will be published. Stay tuned for fresh challenges daily!
🔹 Important Note:
Due to their size, these puzzles may not be suitable for solving on mobile devices. We recommend using a larger screen for the best experience. 🧩🎉

Top rating improvement of the month
affpuzz 265
Gagados 230
ko7ka 214
akio 213
mizm 210

The puzzle below is a current daily puzzle. This puzzle is competitive - you have to register to solve it and participate in the daily competition. To register click Login link in the top right corner.

You can use the scores page to see the results of other competitors for this puzzle.

All the puzzles from the previous days are available at our archive page. Puzzles which are older than 5 days do not affect the score table and can be attempted without registration.

Difference Sudoku

Author: Andrey Bogdanov

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Fill in the grid with digits from 1 to 9 putting one digit per a cell. Each row, column and outlined area should contain every digit exactly once. Numbers at the grid edges show the difference of two neighboring digits.

Example puzzle

Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.