Sudoku-ClassicSudokuPuzzle

About Sudoku-ClassicSudokuPuzzle

Sudoku is one of those puzzles that never gets old, and this version packs in more than 1,200 of them. You fill the grid with digits 1 to 9 so that no number repeats in any row, column or small box.

Four difficulty levels, from simple to expert, let beginners ease in and experienced solvers push themselves. Helpful extras include a pencil mode for jotting candidates, highlighting of repeated numbers, hints when you are stuck, and an undo button for mistakes. You can also switch themes, including a dark mode that is easier on the eyes. The tall layout suits a phone held upright, though it runs just as well on a computer, free in your browser.

Game details

How to play Sudoku-ClassicSudokuPuzzle

1. Choose a difficulty level, from simple to expert.
2. Select an empty cell in the grid.
3. Enter a digit from 1 to 9, avoiding repeats in its row, column and box.
4. Use pencil mode, hints or undo when you need help.
5. Fill every cell correctly to finish the puzzle.

Tips for Sudoku-ClassicSudokuPuzzle

• Turn on pencil mode to note possible numbers instead of guessing and having to undo.
• Scan rows and columns that are almost full first; they have the fewest possible answers.
• Use the highlight feature to spot repeated numbers before they cause a mistake.

Frequently asked questions

More to play: Puzzle games · Sudoku games