How to Play Sudoku

The goal

A sudoku grid is 9×9, split into nine 3×3 boxes. Some cells start filled. Your job is to fill the rest so that every row, every column, and every box contains the digits 1 through 9 exactly once.

How a turn works

Select an empty cell, then enter a digit. If a number already appears in that row, column, or box, it cannot go there.

Use notes to pencil in candidates. When only one candidate remains, place it.

Daily, archive, and unlimited

Today's sudoku is the same for everyone. Come back tomorrow for a new one, open yesterday's board, browse the date archive, or generate unlimited extra puzzles in easy, medium, or hard.