A LITTLE FOCUS. A FRESH START.
Play Sandwich Sudoku
Play Sandwich Sudoku free online. Outside clues reveal sums between 1 and 9, adding a new layer of logic to the classic 9×9 grid.
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The game loads here. Choose a difficulty to start or resume a puzzle.
LEARN THE TWIST
How to play Sandwich Sudoku
Clues sit outside the grid and apply only to digits strictly between 1 and 9 in that row or column. An unmarked row or column has no extra sandwich restriction.
The rules
Fill each row, column, and 3×3 box with 1–9, without repeats. Outside clues give the sum strictly between 1 and 9 in a row or column. Zero means they are adjacent. Unmarked rows and columns have no extra restriction.
A useful first move
Locate the two “bread” digits, 1 and 9, then work out which intervening digits can make the clue. Their order can be reversed: either 1 or 9 may come first.
In a row segment reading 1, 2, 5, 9, the sandwich total is 7. The 1 and 9 are not included. A clue of 0 means the 1 and 9 must be adjacent.
Controls, difficulty, and saved games
Choose Beginner, Easy, Medium, Hard, or Expert above. Select an empty cell, then tap a number or use your keyboard. Notes let you pencil in candidates; three hints are available. Three mistakes end the puzzle.
Every mode and difficulty keeps a separate save in this browser. You can switch puzzles and return to your place. Clearing site data removes these saves; they do not sync with another device or the iPhone app. Settings include night mode and optional automatic cell advancement.
Correct entries earn points. High scores are stored by mode and difficulty and update only when beaten; completed-puzzle count and day streak are shared.
FIFTEEN WAYS TO PLAY
Explore all Sudoku modes
A familiar grid, a different kind of logic. Every mode is free to play in your browser.