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Each row, column and 3x3 square must contain exactly one of each digit, 1-9.
Click 'big' as often as needed to enlarge the puzzle to
a comfortable size (on the grid near the top left corner). Click 'Color' to cycle between
the three available color sets: brights, all white, and pastels.
When you can see the puzzle easily, begin playing. Use the mouse and the arrow keys to navigate the puzzles. Use the spacebar to blank out a square<
Avoid guessing.
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