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    Sudoxxo

    Fill all the cells with X and O following this 3 simple rules:
    • - No more than 2 adjacent X or O in a row or in a column
    • - Equal number of X and O in a row and in a column
    • - There cannot be 2 identical rows or columns
    New game
    X
    X
    X
    O
    O
    O
    O
    X
    New 4x4 game New 6x6 game New 8x8 game New 10x10 game

    About the game

    Easy and interesting logic game - puzzle whose goal is similar to the game of Sudoku, but instead of the numbers from 1 to 9, the symbols X and O are used.

    The game is known by many names, such as Binary Sudoku, Takuzu, and several others copyrighted by some companies names.

    Rules

    Each cell must be filled with X or O following these rules:

    • - There cannot be more than 2 adjacent X or O in a row or in a column
    • - There should be equal number of X and O in a row and in a column
    • - There cannot be 2 identical rows or columns

    To put X in an empty cell, click on it, on second click it becomes O. Click again to remove it.

    When you solve the puzzle, you will see a "Congratulations!" message.

    The game is created for enjoyment and to train your mind. Have fun!

    Playing tips

    Press here to see the tips

    Pairs

    Find a pair in a row or in a column like this: 

    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜🟦🟦⬜⬜⬜
⬜⬜⬜⬜⬜⬜
    and add opposite color next to them: 
    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
🟨🟦🟦🟨⬜⬜
⬜⬜⬜⬜⬜⬜

    Triples

    Find a same cells with an empty cell between them 

    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
    and add opposite color in the empty cell. 
    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜🟨⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜

    Incomplete lines

    Find the rows and columns that have enough cells filled with one color 

    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
🟦🟨🟦⬜⬜🟦
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
    and add opposite color in the empty cells. 
    ⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
🟦🟨🟦🟨🟨🟦
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜

    Similarities

    Find a similar line (row or column) that matches to another fully filled line 

    ⬜🟦⬜⬜⬜🟦
⬜🟨⬜⬜⬜🟨
⬜🟨⬜⬜⬜🟨
⬜🟦⬜⬜⬜🟦
⬜⬜⬜⬜⬜🟨
⬜⬜⬜⬜⬜🟦
    and since no 2 lines can be the same, the empty cells should be filled with the opposite color. 
    ⬜🟦⬜⬜⬜🟦
⬜🟨⬜⬜⬜🟨
⬜🟨⬜⬜⬜🟨
⬜🟦⬜⬜⬜🟦
⬜🟦⬜⬜⬜🟨
⬜🟨⬜⬜⬜🟦

    Impossibilities

    Find a line (row or column) where one is missing from color and if that color is placed on a specific cell, it will be impossible to fill the rest of the line, like: 

    ⬜🟦⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜🟨⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
    The bottom cell cannot be filled with blue because remaing 2 yellows will make a line of 3 yellows, so the bottom cell should be filled with yellow. 
    ⬜🟦⬜⬜⬜⬜
⬜🟦⬜⬜⬜⬜
⬜🟨⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜⬜⬜⬜⬜⬜
⬜🟨⬜⬜⬜⬜