Kropki Sudoku

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Play Kropki Sudoku free online. Standard Sudoku rules plus outside clues: each number gives the sum of the digits strictly between the 1 and the N in that row or column. 27 hand-crafted levels across six tiers.

What is Kropki Sudoku?

Kropki Sudoku is a Sudoku variant where, in addition to the standard row, column and box rules, a clue number sits outside each row and column. That clue gives the sum of the digits strictly between the 1 and the highest digit (N) in that row or column - like the filling of a sandwich whose crusts are 1 and N.

How do I play Kropki Sudoku?

Tap an empty cell to select it, then tap a digit on the number pad to place it. Every row, column and box must contain each digit exactly once, and the digits between the 1 and the N in each row and column must add up to the outside clue. Use Notes mode to pencil in candidates and Hint to reveal a correct cell.

Is Kropki Sudoku free?

Yes. Kropki Sudoku on GameZipper is 100% free to play in your browser. No download, no sign-up, and no ads interrupt your puzzle solving.

How many levels does Kropki Sudoku have?

There are 27 hand-crafted levels across six tiers: Beginner (4x4), Easy and Medium (6x6), and Hard, Expert and Master (9x9). Each puzzle has a unique solution verified by an independent solver.