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copied!<p>Validate the puzzle like this:</p> <ol> <li>Create a boolean array of 9 elements.</li> <li>Loop through every row, column and 9x9 box. <ul> <li>If you read a number, set the corresponding value in the array to true.</li> <li>If it is already true throw an error (impossible puzzle).</li> <li>After reading a row, column or 9x9 box reset the boolean array.</li> </ul></li> <li>Then, if the validation succeeded call the solving method.</li> </ol> <p>EDIT: Source code</p> <pre><code>public boolean checkPuzzle() { boolean[] nums = new boolean[9]; for (int row = 0; row < panel.puzzleSize; row++) { for (int cell = 0; cell < panel.puzzleSize; cell++) { if (nums[puzzle[row][cell]]) return false; nums[puzzle[row][cell]] = true; } nums = new boolean[9]; } for (int col = 0; col < panel.puzzleSize; col++) { for (int cell = 0; cell < panel.puzzleSize; cell++) { if (nums[puzzle[cell][col]]) return false; nums[puzzle[cell][col]] = true; } nums = new boolean[9]; } for (int square = 0; square < panel.puzzleSize; square++) { int squareCol = panel.squareSize * (square % panel.squareSize); int squareRow = panel.squareSize * Math.floor(square / panel.squareSize); for (int cell = 0; cell < panel.puzzleSize; cell++) { int col = cell % panel.squareSize; int row = Math.floor(cell / panel.squareSize); if (nums[puzzle[squareCol + col][squareRow + row]]) return false; nums[puzzle[squareCol + col][squareRow + row]] = true; } nums = new boolean[9]; } return true; } </code></pre> <p>Didn't have too much time to test out, but it might work (?). The row/col variable namings might be incorrect, because I didn't have time to find that in your code, but it shouldn't matter for it to work or not.</p>

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