Printable Hard Sudoku

Set 1vy6516. 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
9 2
9 3 7
5 3 6 2
6 4 8
9 7 3
5 2
4 7 8 2 1 3
3 9 8 5
6 4
Hard #2
9 8
1 8 4 5
6 7 8
7 1 2 3 4
3 4 6 7 8
4 2 9 5
9 3 7 5
9 6
Hard #3
7 3
2 3 6 8
5 9 1
2 3
4 8 2 5
6 5 9 4
2 8 1
1 9
6 1 2 3 5
Hard #4
1 7 4 3
2 5 4 7
4 8 6 3
5 6 7 2
9 6
5 3
3 6 7 9
1 9 3 5 4
Hard #5
5 9
6 2
9 4 7 1 8
8 1 5 6
6 9 3 2
2 3 1
7 2 3 1 8
7 6
1 8
Hard #6
3 8 7
1 3 2
6 8 5 2 3
7 8 6
6 2 9 7
5 4
9 1 3 4
2 9 6
4 5
Hard #7
6 1 2 3
8 2 7
4 6 8
8
5 9 3
1 5 6 2
3 5 1
2 7
9 5 3 4 8 6
Hard #8
2 9
7 4 1 6 3
6 8 9 1
9 1 5
7 1 3
7 9 5 1
2 1
3 2
2 7 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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