Sudoku

Sudoku is a logic-based number-placement puzzle played on a 9x9 grid divided into nine 3x3 boxes. The objective is straightforward: fill every row, every column, and every 3x3 box with the digits 1 through 9, using each digit exactly once in each unit. No arithmetic required — pure deductive reasoning. This version runs entirely in your browser, generates a fresh unique puzzle each time you click New Game, and never needs an account or download.

Choose Easy (around 40 given digits) for a relaxed solve, Medium (around 32) for a satisfying challenge, or Hard (around 26) when you want to push your logical thinking to its limits. Every puzzle is machine-generated with a guaranteed unique solution. Use Check to highlight any cells that conflict with the correct answer, or reveal the full solution with Solve when you are ready to move on.