
Sudoku rules illustrated
A completed grid highlights a row, a column and a 3×3 box to show the three standard Sudoku constraints.
Every nonrepeating 8-digit combination for a Killer Sudoku cage, organized by its total.
Find the sum printed in the cage, then read the combinations on that row. This chart contains all 9 unordered combinations of 8 different digits from 1-9.
A listed combination is a possibility, not a placement. Apply the puzzle's row, column, box and cage constraints to narrow it down.
Image prepared by Sudokumax. Updated .

A completed grid highlights a row, a column and a 3×3 box to show the three standard Sudoku constraints.

A candidate diagram shows the four corners of an X-Wing and the sevens it eliminates in the shared columns.

A row-level diagram shows two cells containing only 3 and 7, followed by the candidate eliminations they allow.