Printable Hard Sudoku

Set 1f91rnn. 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 4 5 7
1 5 8
5 8 3 1 4
3 4 2 6
1 9 5
2 8 3
3 2
7 3 1
5 6
Hard #2
7 3 6
8 7 9 1
6 7 9
2 7
8 3 1 9
2 5
7 1 2 5
5 6 7
2 3 8 6
Hard #3
5 3 4 1
8 7 3 9
1 2 7 3
1 7 2
6 8 3
7 8 4
1 3 5
2 9
1 6 9
Hard #4
4 2 7 9
7 5 2
6 5 4 9 1
6 1 8
8 4 2
1 2
5 8
7 6 3
3 4 6 5
Hard #5
9 4
8 9 2
3 2
9 6 2
7 1 3 6
5 4 7 9
1 4 3
7 6 2 9 4
2 5 6
Hard #6
3 6
7 6 4
1 9 5 3
1 8 5 4
6 2 3 9 1
4 7 2
3 6 5 7
7 8 2 4
Hard #7
4 3 2
9 1
1 8 7
6 8 5
3 1 7 5
9 6 4 3 2
3 4
6 9 7 3 5
5 8
Hard #8
6
2 1 9 4 8 3
2 4 9
3 5 7
3 7 6 1
1 9
9 3 1
1 6 8
8 7 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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