Game technique · Sudoku
Box-Line Reduction in Sudoku
If all candidates for a digit on a row or column lie in one box, remove that digit from the other cells of the box.
🎮 Play Sudoku →How it works
If all candidates for a digit on a row or column lie in one box, remove that digit from the other cells of the box.
Example
If all 4s in a row fall inside one box, no other cell of that box can be 4.
Key point
If all candidates for a digit on a row or column lie in one box, remove that digit from the other cells of the box.