Check Cells puzzles
Method explanation: To use the Check Cells method, pick a cell, then check every cell in the same box, row, or column as that cell to see if it contains a number. Any number in the same box, row, or column as the cell can be eliminated as a candidate. If there is only one possible number remaining for that cell, the cell can be filled in with that number.
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Using the Check Cells method, which number goes in cell B8?
Example:
