2018-Jan-14: I worked on the website today. If you notice that one of the pages has stopped working (probably because I "fixed" something else), please let me know, and I'll try to attend to it quickly.
Thank you for your patience and help! — Jim

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.