hexadoku 16x16 sudoku puzzles to play online

3,000 16x16 puzzles to choose from

Play a 16x16 puzzle at random:

Select a level and a 16x16 puzzle from 1 to 1000:


The higher the puzzle number, the more difficult the solution.

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 Principles of hexadoku 

The hexadoku is 16 X 16 squares instead of 9 X 9 squares. The solving techniques are identical to those of a classic sudoku.

To reduce the size of the grid on the screen and to facilitate entering values, the possibilities are represented here by the following hexadecimal digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F.

The hexadecimal system is a numeral system with a base of 16, using Arabic numerals to represent values 0-9 and the letters A-F for the other six. The hexadecimal is especially useful in computer science because it is much easier to map binary to hexadecimal than to decimal.


We recommend you try Google Chrome, for its speed and its various features are very welcome when it comes to solving puzzles of 256 squares.

 Levels of Hexadoku 

• Puzzles "Beginner" are fully soluble by "Inclusion".
• Puzzles "Confirmed" are fully soluble by "Inclusion" and "Exclusion" while admitting other methods.
• Puzzles "Expert" are soluble with "Inclusion", "Exclusion, and "Multiple Choice". These puzzles do not require more than one hypothesis by multiple choice.
By hypothesis we mean a supposition about the solution of a square in the absence of any logical reasoning.

For more information see: General help