Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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