Printable Hard Sudoku

Set 1at9j75. 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 6 4
1 9
8 7 1
6 3
2 9 1 8
5 2 6 3
9 6 2
3 1 6 9
2 7 1
Hard #2
3 5 8
9 5 8
4 2
9 4
6 7 8
7 6 5
8 1 7
2 4 5 8 3
5 3 7 2 8
Hard #3
4 8 6 2 5 3 7
3 1
7 5 3 6
9 4
4 7 8 9
1 6
5 4 7 1
1
8 4 2
Hard #4
9 3 6 2
9
5 8
6 2 5 4
9 8 4 7
4 7 1 6
1
8 2 6 1 7 9
7 4 2
Hard #5
7 4 2
8 3 4 7
5 2 9 6
5 6 3
4 6
1 2 9
6 3
7 3 1 5 2
2 8 4
Hard #6
8 4 9 3
8 2 1
9 6 8
1 9
8 5 2
1 6 8 7 5
5
8 1 2 3 5
6 1 5
Hard #7
1 5 6 3
7 4 1
9 6
3 6
4 2 8
2 7 4 8 9
5 4 6
3 9 7 1
3 2 5
Hard #8
4 2
4 2 3
9 1 6
6 5
9 1 6 4 7
7 4 9 6
7 4 9
1 7 8
3 5 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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