Sudoku puzzles are represented as 81 long lists of numbers 0-9, 0 represents a blank space. [5, 3, 1, 7, 6, 2, 8, 4, 9, 6, 4, 9, 3, 8, 1, 5, 7, 2, 8, 2, 7, 4, 5, 9, 1 ...