Hard 9×9 Sudoku
Twenty-eight clues and not a single obvious square: this hard 9×9 sudoku is for children aged 9-11 who already solve the medium level on their own.
2 A4 pages · for home and classroom use
Sudoku 9×9 — hard
How to use this worksheet
- No square has a single possible number at the start, so begin by scanning boxes for one number.
- The fourth and seventh rows each show only one number, and the middle-right box only a 9. These areas will open up late.
- Use small pencil marks to track the options.
- If your child gets stuck, check one step against the solution page rather than looking at all of it.
What this worksheet teaches
Like every 9×9 sudoku, this grid needs 1 to 9 once in each row, column and 3×3 box. With 28 numbers given, 53 squares are empty, and the number 6 is printed only once. It has exactly one solution, but simple checks alone cannot reach it. This is real logical reasoning, several steps deep.
Pointing: when a number is locked in one row
Sometimes, inside one box, a number can only go in squares of the same row. You do not know which square yet, but the number must be in that row inside that box, so it can be crossed out of the rest of the row. Solvers call this pointing (the mirror case, a row's number confined to one box, is claiming), and this puzzle needs such steps.