- Solve each of the four 9x9 Sudoku grids independently, ensuring that every row, column, and 3x3 box contains the digits 1 through 9 exactly once.
- The central 3x3 area where the four grids overlap must satisfy the Sudoku constraints for all four grids simultaneously. This means the nine cells in the center must be consistent with the row, column, and box rules of each adjacent grid.
- Begin by filling in obvious single candidates in each grid, using standard Sudoku techniques like scanning rows, columns, and boxes for missing numbers.
- Pay special attention to the overlapping center region; a number placed there affects all four grids. Use this constraint to limit possibilities and resolve conflicts.
- Continue applying logic and elimination techniques across all grids, iterating between them as new information from one grid helps solve another.
- Once all cells are filled without violating any Sudoku rules in any of the four grids, the puzzle is complete.
Parent Tip: Review the logic above to help your child master the concept of printable sudoku fives.
