Sudoku is a logic puzzle played on a 9 by 9 grid divided into nine 3 by 3 boxes. The goal is to place the digits 1 to 9 so that each row, column, and box contains every digit exactly once.
How to play Sudoku
Start by scanning rows, columns, and boxes that already contain many digits. For each empty square, eliminate digits that already appear in the same row, column, or box.
Place a digit when only one value can fit a square, or when a digit has only one possible position within a row, column, or box. Repeat the scan after every placement because each new digit creates fresh constraints elsewhere in the grid. A well-formed Sudoku can be completed by logic and has one solution.
Would you use this tool?
I may add this tool to the site in future. If you would use it, cast a vote to help me decide what to build first.
You can also browse the maths games already available on the site.