- The puzzle is a 16x16 Sudoku variant with an additional constraint: the numbers on each of the two main diagonals must also be unique (1–16).
- Standard Sudoku rules apply: each row, column, and 4x4 box must contain digits 1 through 16 exactly once.
- The diagonals are marked with dashed lines from top-left to bottom-right and top-right to bottom-left.
- To solve, start by identifying cells with only one possible value based on row, column, box, and diagonal constraints.
- Use pencil marks to track candidates and eliminate impossibilities.
- Focus on regions where diagonals intersect boxes or rows/columns with many givens to narrow options.
- Progressively fill in cells using logic until all 256 cells are filled without violating any constraints.
Parent Tip: Review the logic above to help your child master the concept of free printable diagonal sudoku.
