Sudoku Variations Puzzle Book for Adults - 300+ Hard Puzzles: Center Dot, Consecutive, Even-odd, Hoshi, 12x12 Jigsaw, Butterfly, Outside, Flower and Samurai Sudoku for Hours of Fun
Sudoku Variations Puzzle Book for Adults - 300+ Hard Puzzles: Center Dot, Consecutive, Even-odd, Hoshi, 12x12 Jigsaw, Butterfly, Outside, Flower and Samurai Sudoku for Hours of Fun