200 Strong Calcudoku and 200 Jigsaw Sudoku very hard levels.: 9x9 Calcudoku complicated version very hard levels + 9x9 Jigsaw Even - Odd puzzles X diagonal sudoku very hard levels. Holmes presents original puzzle. (plus 500 puzzles that can be printed).
(Calcudoku and Jigsaw Even - Odd Classic Sudoku, #5)
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200 Strong Calcudoku and 200 Jigsaw Sudoku very hard levels.: 9x9 Calcudoku complicated version very hard levels + 9x9 Jigsaw Even - Odd puzzles X diagonal sudoku very hard levels. Holmes presents original puzzle. (plus 500 puzzles that can be printed).
(Calcudoku and Jigsaw Even - Odd Classic Sudoku, #5)
