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I hired a developer to create a sudoku generator for me. It generates 4x4, 6x6 and 9x9 with the difficulties easy, medium, hard, very hard. This is from a 6x6 very hard

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Krychle Sudoku 4x4: 120 3D Sudoku Cubes, 3 grids in 1 by Sudoku Magazine, Paperback