Printable Hard Sudoku

Set 10yyvr3. 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
1 4
2 5 9
9 7 8 1 2
4 2 9 5
1 2 5 6
7 6 8
5 9
9 3
3 6 1 5
Hard #2
5 8 6 9
2 3 4 1
4 7 5 3
1 9 4 7
4 5 6
2 8 1
6 8 5 1
4
7 6
Hard #3
4 9 6
6 2 1 5
2 1 7
6 3
4 1 6 3 9
8 9 1
6 3
5 9 8
3 4 9 7
Hard #4
2 1 7
5 4 6
5 9 8
2 5 1
9 1 7 4 6
6 3
4 6 7
8 5 9 2
7 2 3
Hard #5
6 7 3 2
1 9
3
8 5 7
9 2 8 1
9 2 1 6
9 8
5 6 2 7
8 1 9 3 5
Hard #6
9 3
3 1 5
5 2 4 7 1
1 8 2
7 9 6
3 4 8 9
8 4
2 4 5 1 8
7 8
Hard #7
9 5 6 2
4 6 2 1
6
8 5 3
3 2 1
9 8 6
5 1 8 4
7 1
8 6 5 9 2
Hard #8
1 2 5 6
5 9 7
3 2 4
3 4 6
7 2 1 3
4 1 9 8
2 6 7
1 5 7 8
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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