Printable Hard Sudoku

Set 1r8w8l7. 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
2 6
7 3 9
1 7 2
8 2 9
5 9 7 6
7 8 4
8 6 2
6 4 8 3 7
4 3 1
Hard #2
2 9 5
2 9 1 7
5 8
1 2 4 6
8 4 3
3 1 5 2 9
1 5 4 6
4 8 3
1
Hard #3
4 7 2
3 4 8
2 5 9
5 1 3 9
4 7
9 3 1
1 8 9 5
6 2 8
4 2 1 6
Hard #4
6 7
8 3 2 6 1
9 3 2
7 2 5
6 8 9 3
7 4 8 6
1 9 3
6 4
4 2 3
Hard #5
8 5 6
3 7 5 2 9
2 7 1 6
2 3
9 7 8
5 9 4
3 9 4
4 5
1 6 2 4
Hard #6
1 3
1 6 4 8 9
5 6 3 7
8 2 6
2 5 1 7
4 7 6 9
4 1 5
7
3 2 6
Hard #7
4 6 1 7
5
8 1 9 5
2 5 8 6
8 2 4
7 9
9 4
8 7 5 1
3 2 1 8 7
Hard #8
6 9 2
2
5 4 7 3 6
7 1 6
2 5 6 4
8 3
7 3 2 5
8 6 3
9 6 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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