X-Wing Sudoku diagram
A candidate diagram shows the four corners of an X-Wing and the sevens it eliminates in the shared columns.
Sudoku rules illustrated
A completed grid highlights a row, a column and a 3×3 box to show the three standard Sudoku constraints.
How to read this diagram
Each highlighted unit contains digits 1–9 exactly once. All other rows, columns and boxes follow the same rule.
This is a completed teaching example, not an unsolved puzzle. Read the rules lesson for a fuller explanation.
Image prepared by Sudokumax. Updated .
More to explore
All Sudoku images
Naked pair Sudoku: before and after
A row-level diagram shows two cells containing only 3 and 7, followed by the candidate eliminations they allow.
Killer Sudoku two-cell sum combinations
A complete reference chart of the nonrepeating digit pairs for two-cell Killer Sudoku cages, covering sums 3–17.