Very Difficult Sudoku X Puzzle : r/sudoku

In some sudokus main diagonals also contain the digits 1 through 9. This variant is called Sudoku X (Diagonal Sudoku). Use the check box Diagonals

Diagonal Sudoku: Sudoku X : 250 Very Hard Sudoku Diagonal Puzzles (Series #13) (Paperback)

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Hard Sudoku puzzle 50 challenging sudoku puzzles to solve 4*4 sudoku grid - (Activity Books) 2nd Edition,Large Print by William Liam (Paperback)

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This is a printable collection of 100 Hard Difficulty Sudoku puzzles and solutions. , - One 9 x 9 puzzle per A4 page., - Answers at the back, Build

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An example Sudoku X puzzle Download Scientific Diagram

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Creating extremely hard puzzles from scratch : r/sudoku

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