Classic Sudoku
About Classic Sudoku
Classic Sudoku is the traditional number puzzle played on a 9x9 grid. Your goal is to fill every cell with the correct digit while following the standard placement rules. It runs right in your browser, so you can jump into a grid and start training your logic and focus whenever you like.
How to play Classic Sudoku
Fill each row, column, and 3x3 box with the numbers 1 through 9, with no repeats in any row, column, or box. Some cells start filled in as clues, and you build outward from those by figuring out which numbers fit where. Click or tap a cell, then choose the number you want to place there. Keep going until the entire grid is complete and correct.
Tips for playing Classic Sudoku
- Scan each row, column, and box for numbers that are missing, then check which cells can only hold one possible digit.
- Work on the areas with the most starting clues first, since they narrow down possibilities faster.
- If you get stuck, step back and look for a number that can only go in one specific box across three rows or columns.
Frequently asked questions
How do you play Classic Sudoku?
You fill the empty cells of a 9x9 grid so that every row, column, and 3x3 box contains the numbers 1 through 9 without repeats, using the given clues as your starting point.
Do I need to download anything to play Classic Sudoku?
No, Classic Sudoku runs directly in your browser and is free to play, so there is nothing to install.
What are the basic rules of Classic Sudoku?
Each row, column, and 3x3 box must contain the digits 1 through 9 exactly once, with no repeated numbers in any of them.
