Printable Hard Sudoku

Set 1o1ry78. 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
3 7 2
6 7 3 4 1
2 4
5 4 7 6
7 9
6 4 8 2 3 7
8 3 9
6 8 5
Hard #2
6 2 1
1 7 3
9 4 5 7 6
6 1 2
3 5 4
2 1 8 7
7 6 3 1
8
3 6 9
Hard #3
9 5 6
3 4
2 6 9 5
4 2
8 6 5
6 5 7
6 7 8 1
1 5 6 9 7
2 7 8
Hard #4
5 1 3
2 8 4
7 4 9
4
6 2 9 1
9 8 1 6
6 2 9
9 1 3
1 7 2 8 9
Hard #5
5 2 7 4
2 5
3 6 8 1
1 6 9 3
1 7
3 4
2 7 6 5
1 5 2 9 3
9 8
Hard #6
8 1
4 3
6 9 1
3 9 5
2 5 6 3 1 7
3 1 9
7 2 6
1 8 5 3
3 9 6
Hard #7
5 3 4 7
1 9 6
7 2 6
4 7
1 7 2 5
2
3 2 6
1 5 8 7
4 6 1 9 3
Hard #8
8 9 1 3 5
2 4
7 5 9
5 3 2 9
2 6 4 3
6
3 2 7
6 1 8 2
5 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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