Printable Hard Sudoku

Set swr8x7. 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 9
1 3 2
6 3 8 2
9 5 2 8 6
5 7
5 8 6 2
1 6 4 3
8 5 1
Hard #2
3
9 2 7
7 4 3 5
7 1 9
2 3
3 4 9 5 2 7
3 7 6
4 1
1 6 2 5 4
Hard #3
4 1 7
6 3 2
5 6 2 3
9
3 7 6 9
8 7 5 1
1 9 4 3 8
6 9
3 5 7
Hard #4
4 6 3 1
2 4 7 6
8
9 8 6 5
5 2 3 4 7
7 6 9
2 5
1 8 9 3
6 4
Hard #5
9 8 7
4 5 8 6
1 2 9
1 9 8 2 3 5
3 5
1 4
9 6 1
4 6 7
4 8 3
Hard #6
8 3 7 4 1
7 3 4
2 8
2 7 9 6
4 3 2 5
8 3
6
5 4 6 1 7
6 8 2
Hard #7
6 8 3 9
9 1 3 4 5
2 1
1 5 4 7
7 4 9
3 2 1
1 8 4
4 3 2
2 6
Hard #8
6 5
4 7 5
9 1 8 3 4
4 8
8 4 9 7
5 6 9
3
9 5 2 6 7
6 7 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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