Sudoku

Objective and rules

Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1 through 9 exactly once. Each puzzle has one valid solution.

Choose Easy, Medium, or Hard. Use candidate notes to reason through uncertain cells, and use the available hints when you need help.

Controls and scoring

Select a cell, choose a digit, and use Notes to track candidates. A completed puzzle can qualify for the leaderboard; three rejected wrong entries end the puzzle.