Printable Hard Sudoku

Set 1axndh4. 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
8 5 2
3 1 4
2 6 8 7
4 1
1 5 3 4
4 7 6
1 3 2 4
9 6 5 3
6 5
Hard #2
2 5 6 9 1
6 3 5
2 3
3 7 5
9 5 8 6
4 7 6 2
9 2
7 1
9 7 3 5
Hard #3
1 8 3
6 7 3
4 5 9 6
2 4 3 5
5 3 7
4 7 6 8
1 5 7
5 9
2 4 8
Hard #4
2 9
8 9
7 1 3 6 8
8 9 5
5 1 6
9 4 8 1 3
6 3 2 5
2 1
3 6 8
Hard #5
9 6 4
2 9 3
6 4 9 2
5 7 6 9
3 9 6 8
8 1 2
7 2 5 9 8
3
4 1
Hard #6
4 5
8 1 7 6
2
2 6 3 1
4 5 9
3 5 1 7 8
7 1 3
4 7 9
9 4 7 1
Hard #7
4
4 6 9 7
1 9 2 6
6 5 8 2 3
8 9
5 7 6
1 6 7 8
4 7
4 9 6 1
Hard #8
2 6
7 9 8 2
8 6 9
5 3
4 5 9 7
3 1 4 8
4 2
3 4 2 6 1
1 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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