Printable Hard Sudoku

Set 1pbts2s. 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 4
9 5 6
6 4 3 5
7 3
8 3 7 5
3 4 6 5
1 2 7
5 1 6
6 7 9 4
Hard #2
3 1
4 9 8 5
5 1
1 2 6 3
4 3 9 1 8
1 3 4 2
7 8 3
3 4 7 9
9
Hard #3
8 2 3 6
9
9 3 8 1 2
3 9 4
1 6 3
9 2 5 7
4 7
7 3 2 9 1
2 1
Hard #4
6 2 8 4
5 2
3 9 8 7
7 6 2 8
3 9 5
8 4 5 2
1 8 7
7 5
3 1 6
Hard #5
3 7 8
9 8 6 3
2 7 5 1
7 6
4 3 8
1 3 2 4
8 5 3 9
4 1 6 3
2
Hard #6
8 6
7 9 5
2 8 3
7 3 2
4 9 1 5 7
1 8
2 9 8 7 3 6
9 5
3 5 7
Hard #7
6 3 2 7
7 8 6 4 1
8
3 5 2 8
1 6
8 2
2 5
9 5 1 3
1 2 9 6 4
Hard #8
9 2 3 4 6 1
5
1 2 3
9 1 3
7 5 9
7 6 5
1 4 5 7 6 2
5 8 4
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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