X-Factor is a classic Sudoku variant. In addition to the normal rules of Sudoku, both the main diagonals must also contain all the digits from 1 to 9. Puzzles are categorised into four levels of difficulty: mild, medium, tricky and extreme. Sixteen pages with 50 puzzles, plus solutions.
Available only as a PDF download to print out at home. Immediate access via order confirmation email.
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