Printable Hard Sudoku

Set 1l7rzht. 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 2 9
2 7 3 8 6
9 6 5 7
1
1 5 3 7
9 4 3 2
7 2 9 8
1 7 4
Hard #2
2 4
3 2 9
7 6 2
5 6 2 3
2 3 4 9 8
8 1 7
4 2 3 7 8
7 6
3 1
Hard #3
7 1
1 9 2
5 6 4
5 1 9
4 3 9
9 3 8 1
4 3 1 9 6
4 9 8
2 6 7
Hard #4
8
6 3 2 1
4 5 7 3
8 2
9 2 3 1 6
1 8 9 2
4 5 8
9 7 2 3 6
9
Hard #5
4 9 7 1
9 5
5 2 4
1 5 7 2
3 1
2 9 4 1 6
5 6 9
7 6
9 6 4 8
Hard #6
8 4 7
5 6 2
4 1 3
1 8 4 9
2 1 5 7 8
8
5 6 9
8 1 2
1 7 5 8
Hard #7
9 8
3 1 8 5
5 4 3
8 5 9 7
3 1 7 5
2 6 1
5 4 6
7 1 8 6 9
2
Hard #8
8 3
2 8 3 5
2 7 5 9 4
6 2 9
6 1 4 2
5 8
4 8 9 6 1
4 1 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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