Challenges are partially completed puzzles that have one number circled. The "challenge" is for you to figure out how that number was discovered. Try to figure out why each circled number is correct, then click on the answer.
These challenges may help you learn new skills and teach you new ways to view sudoku puzzles which can improve your solving speed and help you solve harder puzzles.
There may be more than one way to discover a given number. The answer page will sometimes give you more than one way to find it. But you may also discover ways that aren’t listed.
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