Winter 2023
The Krazydad Discord Community is a new place where you can talk to me, and meet other people who are interested in puzzles. A great place to report problems or mistakes with this website, suggest new features, help me brainstorm and test out new puzzles, get periodic announcements from me, or discuss other deep thoughts. Maybe I'll see you there!
Hexadecimal Sudoku Puzzles by Krazydad
Hexadecimal Sudokus (also known as 16x16 Sudoku) are a larger version of regular Sudoku that feature a 16 x 16 grid, and 16 hexadecimal digits. Each row, column and 4x4 block contains all the digits 0 thru F (or numbers from 1 to 16, in the decimal versions).
My Hexadecimal Sudoku puzzles are collected in 100 printable booklets per volume. Within each volume, the puzzles are also ordered by ascending difficulty. Each booklet contains eight puzzles, instructions, hints, and answers.
Puzzles are available in both hexadecimal (0-F) and decimal (1-16) notation.
Select a difficulty level:
These puzzles require basic Sudoku strategy. If you have not solved Sudoku puzzles before, you will probably find them quite difficult!
These puzzles require more sophisticated Sudoku strategy.
Tough puzzles require more advanced Sudoku strategy, such as X-Wing, XY-Wing and Swordfish.
These are the toughest Hexadecimal Sudokus I make, and may require a little trial-and-error to finish.
How to use the hints
My puzzles contain a page of hints in addition to a page of answers.The hints are puzzles grids that contain numbers showing the order in which the squares were solved by the computer. Although this is not necessarily the order you would solve the puzzle, it's probably pretty close.
Follow the numbered squares in order 1,2,3,4,5... until you find a square you haven't solved yet. This square (or the one or two immediately after it) is a good candidate to solve next.