Printable Hard Sudoku

Set 17pdfu9. 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 3
6 2 1
2 4 5 6 9
6 3 5 2
5 7 4 1
9 4 5 7
7 9 3 8
8 4 1
Hard #2
8 4 1 2
9 8
7 2 5
6 3 7 4 1 2
9 2 5 7
4 7 6
5 2 9
4
7 4 1
Hard #3
5 9 1 2
3 9 2 4 6 7
2 7 9
1 5
8 4 1
2 1 3 7
1 9 6 4
5 8
7
Hard #4
3 4
9 1 5 7
2 5 3
7 3 6 8
1 8 2 6 4
8
4 5 9 1
1 4 8
1 7 5
Hard #5
2 6
1 3 8
7 6 3 5
4 3 8
1 8 6
4 3
9 7 2
1 4 7
5 2 9 7 1 4
Hard #6
4 9 6 7
4 8 1
3 9 8
2 1 7
1 3 4 2 9
5 3
7 2 8 5
8 5
4 5 6
Hard #7
9 2
6 1 8 7 4
3 7 6
9 2 8
3 1 8
1 8 4 3
4 1 7
7 2 6
3 7 5
Hard #8
1 3
4 2 6
6 8 1 7
7 1
2 8 9 3 4 6
1 9 3
4 8
8 2 3
9 7 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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