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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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Sudoku Challenge

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Mini Sudoku 6X6 - Medio - Volume 45 - 276 Puzzle 9781512107692

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Sudoku Generator » sudoku-kids-6×6-01