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The officers in the Secret Order of Sudoku upped the ante with this one: The X in the middle is also a no-repeat zone.

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You will solve a 9x9 grid. Some of the grid squares already contain the answers. To complete the puzzle, fill in the empty squares of the grid with the digits 1 through 9.The puzzle is solved when each row, column, house, and diagonal contains the digits 1 through 9 with each digit only appearing once. &nbsp;<h3>Controls</h3>Use notes to keep track of possible answers. Select a cell(s) and click the notes button.&nbsp;If you get stuck, click the lightbulb to reveal hint options.&nbsp;Auto Notes will autofill all possible notes without impacting your score.Check Cell, Check Level, Reveal Cell, and Reset are all considered hints. You must disable Expert mode to use hints, which impact your score. &nbsp;<h3>Scoring</h3>Your score is based on the time it takes to solve the puzzle and how quickly you enter correct answers. The higher the star rating, the higher the maximum points available.&nbsp;The point value of each cell entered correctly decreases by 20 points for each minute spent. &nbsp;

How to Play 

partially completed sudoku x board on yellow background

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sudoku x icon white grid on a yellow circle

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This medium-level Sudoku version ups the ante on the original: The X in the middle is also a no-repeat zone.

Sudoku X - Sudoku | Puzzle Society

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This Sudoku version ups the ante on the original: The X in the middle is also a no-repeat zone.