Printable Hard Sudoku

Set nhkt43. 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 2 6 7
8 5 4 9
9 6
1 6 8 5 3
1 6
7 1 8
9 4 3 7 6
5 3
8 2
Hard #2
2 9 5
3 4 1
4 5 6 2
2 8 7 3 6 1
8 3
9 2
4 2
7 1
1 5 8 9 6
Hard #3
3 4 6
2 7
5 7 3 1 8
8 9
5 2
1 3 2 6 8
8 5 1 7
6 9 4
7 6 9
Hard #4
1 9 8
5 2 6 4
3 4 2
8 4 7
1 9 4 6
4 7 2 9
7 4 1
4 6
9 5 2
Hard #5
2 1 7
8 9 1
4 2 5
9 4 6
2 1 7 4 8
4 5 9 7
7 3 9 4
1 2
8 5
Hard #6
7 8 4
1 5 7
4 9 3 2
2 1
5 9 6
5 7 6 2
1 6 9 8 5 3
5 4
1 6
Hard #7
2 4 5 7
9 3 2
6 9 5
4 5 7 9
7
6 9 4 3 2 5
7 2 3 1
9
4 6 2
Hard #8
7 5 4
7 6
6 5 2 8
8 2 5 9 7
3 6 4
7 4 3 5
8
7 3 5
4 1 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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