The Roman Sudoku book is available for purchase at lulu.com!
The book contains 40 Roman Sudoku puzzles: 10 very easy puzzles (perfacile), 10 easy puzzles (facile), 10 difficult puzzles (difficile), and 10 very difficult puzzles (perdifficile), with solutions provided. The book is spiral-bound, making it convenient to handle while you are working a puzzle.
Here is one of the very difficult (perdifficile) puzzles. You can also view a larger version suitable for printing.
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