Do you want to become a sudoku master? Try some next-level sudoku - the sudoku in this book use Roman numerals instead of the usual Indo-Arabic numerals - ideal for anyone who has conquered the traditional grid. 100 9 by 9 Roman numeral sudoku - the sudoku gradually increase in difficulty through the book - all solutions given at the back of the book This book has one sudoku per page - so they're not squashed together and difficult to read.