Free Sudoku

First select a digit on the side of the grid. Then click on the cells where you want to place the selected digit. You may enter more than one digit in a cell as a note by activating the pencil mark option near the upper left corner of the grid.

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Also Try Sudoku Levels Sudoku Easy. Sudoku Medium. Sudoku Hard. Sudoku Expert. Use logic to solve this fun sudoku puzzle!

Seasonal Sudoku Games Sudoku. Spring Sudoku. Summer Sudoku. The more candidates you note down, the noisier the puzzle will become which not only will it make it more stressful, but it can prevent you from finding easy numbers like naked singles.

Your skills will improve after each Sudoku challenge. With time, the brain becomes faster and better at finding the weakest spots, possible candidates and crossing all the information of rows and columns at once to find the solution.

Its increased performance also extends to memory and pencil notes become less important. A beginner challenge that once looked anything but easy can turn ridiculously quick to solve after just a few puzzles.

Sudoku is such a simple and yet popular game precisely because it is a battle against oneself and you can experience the results of your training firsthand.

Focus on each square at a time. Compare the missing numbers with those on the rows and columns of the grid that reach the square. If they contain any of the missing numbers, you can eliminate the blank cells on the square from that row or column.

Count the numbers of each row to find the missing ones. Repeat the process at each column. Even when the placement of a number is not certain, you can sometimes determine that it will be without a doubt positioned in a certain row or column.

Take note of that position and use it to eliminate other possibilities in the squares connected to that column or row in the grid.

This strategy is normally used in the hardest levels of Sudoku. The goal is to eliminate possibilities pencil notes.

You can use it when you have the same candidate in 4 spots that form a square or a rectangle when connected by row and column. If you connect each of the extremities of the square you discover that one of those pairs will be the correct one in the end.

If you test either of the possibilities, you might be able to eliminate the digit being analyzed from other pencil notes in different cells.

To apply this method, you must have 2 identical candidates in the same row, in three different rows. These candidates must also be connected by column, regardless of the shape they create.

When you connect the different possibilities, you should have a closed chain. In the end, you will have only two sets of possible answers.

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