Printable Hard Sudoku

Set 19v1x88. 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
8 3 6
4 1 5 8 7
7 1 9
8 1 9 7
6 1
2 9 8 6 1
5 4
3 9 5
7 2
Hard #2
3 2
8 4 5
1 6
2 5 1 6
9 2 1 3
6 8 3 2
1 4 6 5
8 3 5
6 1 8
Hard #3
6 9 8
2 8
6 2 3
2 9 5
1 8 2 4
2 1 5 7
4 3 2 1
1 9 3 7
3 5
Hard #4
8 7 5 3
2 8 6
2 3 4 8 7
3 7
2 8 6
7 1 4 5
4 9 1 6
1 3 5
6
Hard #5
3 6 7 1
1 9 3 5
6 9 4
8 7
5 9
8 3 2 4 6
9 5
3 8
4 2 6 5 7
Hard #6
1 7 4 8 9
2 4
4 3 2 9 1 5
7 8 2 4 3
1 3 9 6
6 4
9 8 6 3 2
Hard #7
7 4
6 1 8 9
5 9 2 1
9 6 3
2 7 1
4 9 3
6 7 4
1 3 5
4 5 1 7
Hard #8
9 6 5 8
8 4 3 7 2
1 8
1 2 3
7 2 3 6 1
9 4 7
8 5 9
3 5 7
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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