Play Sudoku

Sudoku game info

The goal of sudoku is to fill each square in the grid with a number between 1 and 9. Each row, column, and 3x3 subgrid should contain each number just once.

Levels of difficulty

You can choose between 3 levels of difficulty: beginner, intermediate and advanced. The amount of given numbers at the start decreases when you pick a higher level, so it becomes harder to fill in the puzzle.

Tips to solve a Sudoku

Besides the general advice to use your logical thinking to solve the sudoku, there are some tips that can help you:

• Concentrate on one number, for example a number which already appears often.
• Start with rows, columns or 3x3 blocks which are already quite full.
• You can take notes in the squares, listing the possible numbers for that square. Every time you fill a number in the same row, column or 3x3 block, you can erase it from the possibilities of the other squares in the row, column and block. This way you will end up with 1 final option and you can fill it in.

Strategies

There exist various strategies for filling in numbers and removing candidates. We list two of them below, but there are many more which you can discover while playing!

Sole candidate

You can fill in a number if there is only one candidate. For example, only number 9 can be placed in the green box because all other numbers are already placed in a column, row or box of the green box.

Box and Column/Row interaction

You can remove candidates by using the knowledge that each number appears only once in a row, column or 3x3 block. For Example, there has to be a 9 in one of the green boxes. This means that a 9 cannot be placed in any of the boxes marked with an X.

Similar games

Other logic-based puzzle games on our website are Suguru, Kakuro and Futoshiki.

System requirements

Sudoku can be played in all modern browsers, on all device types (desktop, tablet, mobile), and on all operating systems (Windows, macOS, Linux, Android, iOS, ...).