Printable Hard Sudoku

Set 1nh9pg2. 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 8 6 2
9 4 1
2 9 3 8
1 4 9
5 3 6
7
8 1 6 4 5
4 7
6 1 7 9
Hard #2
2
8 1 6 9
5 6 2 8
4 3 6 7
9 8 4
3 7 2
7 1 5 8 3
5 6 1 8
5
Hard #3
9 7 6 2 1
4 3 9 8
1 9
9 4 6
6 9 7 5 2
2 5 1
3 1
2 3 5
6 3
Hard #4
3 2 7 6
9 5 8
4 2
1 6
8 6 2 9 7
9 4 7 8
4 3
8 4 3 7
2 6 8
Hard #5
4 3 7 5
2 5 9
1 2 4
3 8
1 3 5 7
8 5 9
6 9 2 5 3 4
8
4 8 6
Hard #6
8 2
4 2
6 3 1 8 4
6 5 1 7
6
7 3 9 6
7 4 8 9
3 7
2 8 7 1 4
Hard #7
6 9 5
1 2 8 3
5 7 4
7 4 9
1 3 8
8 4 1
5 4 2 3
1 9 2 6
6 7
Hard #8
7 3 8
2 6 4 7
3 7
9 2 3 5 1
1 7 9
4 2 6
9 6 5
9 1 2 6
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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