Hexadoku – Play The 16×16 Sudoku Variant 

Hexadoku (also known as Hexadecimal Sudoku or simply 16×16 Sudoku) is a larger variant of Sudoku that uses a 16×16 grid instead of the regular 9×9. 

Instead of 9 3×3 subregions, Hexadoku has 16 4×4 subregions. In each of these subregions, either the numbers from 1 to 16 or the numbers 0 to 9 plus the letters A to F must appear once. 

These numbers or numbers and letters also need to appear exactly once in each column and row as well. 

How to Play 16×16 Sudoku with Letters and Numbers

Essentially, Hexadoku is just a larger version of Sudoku with the same fundamental rules and logic. 

Having to deal with these extra numbers and letters also makes Hexadokus more challenging to solve than regular Sudoku, but it doesn’t change the fundamental way you play. 

So you can approach Hexadokus the same way you play regular Sudokus. You just have to keep more numbers and letters in mind.

If you’re feeling up to the challenge, you can have a crack solving some of the puzzles below.

Play 16×16 Sudoku Puzzles

If you’re interested in trying out Hexadoku for yourself, check out the three sample puzzles below at different difficulty levels. 

You can find more Hexadoku puzzles over at Krazydad. 

Easy

Medium

Hard