Sandwich

How to play

• Tap a cell to cycle through the numbers (1–n) and back to empty.
• Every row and column contains each number exactly once.
• Each outside clue is the sum of the numbers between 1 and n (the largest number) in that row or column — the "sandwich filling".
• Every board has exactly one solution, machine-verified before publication.

The sandwich-sudoku idea, distilled to a five-minute daily grid. Sister puzzles: Gridlings.

FAQ

How do you play Sandwich?

Fill the Latin square so each row and column contains every number once, and each outside clue equals the sum of the numbers sitting between 1 and the highest number in that line — the sandwich filling.

Is there a new Sandwich puzzle every day?

Yes — a new daily board goes live at 00:00 UTC, the same board for every player worldwide, with streak tracking. Unlimited free play in three difficulties and a full archive of past dailies are also free, with no account and no ads.

Can Sandwich be solved without guessing?

Yes. Every published board is machine-verified before release: a solver proves exactly one solution exists and is reachable by logical deduction, so there is always a provable next step.