This is a version of Sudoku; you have to use your powers of logic in order to complete the grid correctly. Each column, row and 3x3 box should contain the numbers 1-9 only once.
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Click on a number on the left-hand side, then click on the box where you want to place it. Bear in mind that each column, row and 3x3 box should feature each of the numbers 1-9 only once. If you place a number incorrectly, it will turn red. Click 'Solution' if you want to see how the puzzle should be completed.