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Hard (ages 10-12)

🔢 9x9 Sudoku for Kids — Hard

Free printable 9x9 sudoku puzzles for kids, ages 10-12. Fill in the missing numbers, no repeats in any row, column, or box!

Puzzle 1

6
8
3
4
2
1
8
6
7
9
3
5
7
6
2
1
5
2
9
5
6
8
3
7
7
8
4
1
6
7
4
6
2
1
3
3
9
6
2
8

Puzzle 2

7
1
4
4
1
5
7
3
9
1
2
4
6
5
9
4
9
8
6
5
1
4
6
9
2
7
4
1
3
9
8
3
7
9
1
6
1
4
5
7

Puzzle 3

9
2
7
3
4
1
1
3
4
5
6
2
6
4
8
9
5
9
8
5
3
6
7
3
4
9
6
2
8
6
1
3
6
2
5
1
4
8
6
7

Puzzle 4

6
9
3
7
6
9
2
8
4
8
2
4
3
2
9
9
1
4
2
5
3
5
9
1
4
1
3
9
5
4
8
4
9
7
2
9
2
6
8
3

Puzzle 5

9
4
5
7
3
5
8
1
9
6
8
1
4
5
2
9
6
3
7
2
7
5
6
4
7
3
2
9
1
1
7
9
6
5
6
5
6
3
1
8

Puzzle 6

6
8
3
2
5
7
6
2
9
6
8
1
3
9
4
2
7
2
5
9
3
4
1
3
2
5
6
2
9
4
1
7
9
6
2
1
8
3
9
5

About Hard Sudoku

This Hard Sudoku is a full classic 9x9 grid with numbers 1 through 9 and nine 3x3 boxes, the same format used in newspaper and puzzle book Sudoku. It is sized for older kids and tweens who want a genuine challenge and are ready to track several rows, columns, and boxes at the same time.

A 9x9 grid demands sustained focus, careful notation, and real logical deduction, skills that carry straight over into algebra and problem solving. Working through nine interlocking groups builds patience, strengthens working memory, and rewards kids who slow down and reason through each move instead of rushing. It is a satisfying, screen free challenge for a rainy afternoon.

Work through each row, column, and 3x3 box, noting which numbers are already placed. Look for squares where only one number fits given its row, column, and box, and fill those in first. As the grid fills up, more squares become solvable. Some tricky puzzles benefit from lightly penciling in candidate numbers before committing to an answer.

Ready for a different challenge? Try 4x4 Easy Sudoku or 6x6 Medium Sudoku!

Frequently Asked Questions

▶What size is the Hard Sudoku grid?

The Hard Sudoku uses a full classic 9x9 grid with numbers 1 to 9, arranged in nine 3x3 boxes, the same size used in newspapers and puzzle books.

▶What age is Hard Sudoku designed for?

Hard Sudoku is designed for ages 10 to 12. The 9x9 grid takes sustained focus and multi step logic, so it suits older kids and tweens who want a genuine challenge.

▶Is this Hard Sudoku free to print?

Yes, completely free, no signup needed. Print these Hard 9x9 Sudoku puzzles as many times as you like.

▶Does the Hard Sudoku include an answer key?

Yes. Even at 9x9, the full solved grid for every puzzle prints on a separate answer key page, so solutions are easy to verify.

▶Can I use Hard Sudoku in my classroom?

Definitely. Hard Sudoku works well as a challenge station, fast finisher task, or math club activity for older elementary and middle school students. Free to print for the whole class.