Sudoku is a logic-based number puzzle game. The goal is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids (also known as "boxes" or "blocks") contain all of the digits from 1 to 9. No number can be repeated in any row, column, or block. MoonDoku makes it easy to learn with helpful hints and highlighting.

The rules of Sudoku are simple:

• Every square has to contain a single number.
• Only the numbers from 1 through 9 can be used.
• Each 3×3 box can only contain each number from 1 to 9 once.
• Each vertical column can only contain each number from 1 to 9 once.
• Each horizontal row can only contain each number from 1 to 9 once.

Yes! MoonDoku allows you to play free online Sudoku puzzles every day. We offer multiple difficulty levels including Easy, Medium, Hard, and Expert to suit players of all skill levels.

Playing Sudoku daily is a great habit for your brain. It improves concentration, logical thinking, and memory. Many players find it relaxing and a perfect way to take a break from the stress of the day.