Kropki

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.
• A white dot between two cells means they differ by exactly 1 (like 3·4).
• A black dot means one is double the other (like 2·4).
• No dot means neither relation holds — the absence of a dot is a clue.
• Every board has exactly one solution, machine-verified before publication.

Most days need no given numbers at all — the dots alone pin the grid. Sister puzzles: Gridlings.

FAQ

How do you play Kropki?

Fill the grid so every row and column holds each number once. A white dot between two cells means they differ by exactly 1, a black dot means one is double the other, and no dot means neither relation holds — the absence is a clue too.

Is there a new Kropki 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 Kropki 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.