To solve the puzzle you must make sure that every column, row and 3x3 box contains the numbers 1 through to 9.
Almost all of the puzzles can be solved using logic alone and there is no need to guess. A puzzle can take from 20 minutes to 2 hours to complete depending on its level and your experience.
People have developed a range of methods and tactics in order to solve the puzzles.
A Random Puzzle is shown here each time you refresh the page. There also many more puzzles on this site. You can also use the Puzzle Solver if you get stuck.
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