Printable Hard Sudoku

Set 1cts3a3. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

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

Answers are on the last page of the PDF.

Rather play online?

Play hard sudoku in your browser with notes, hints and undo. Free, no ads.

Techniques for hard puzzles

More printable sudoku

Printable Easy Sudoku · Printable Medium Sudoku · Printable Expert Sudoku · All levels