Printable Hard Sudoku

Set 1n0gb6f. 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
6
2 5 7
4 7 8
6 5 2 9 4
5 4 3
2 9 6 5
9 2 7
1 2
7 1 8 3 5
Hard #2
2
9 5 3 4 2
1 5
6 9 3 5
6 7 9
1 4 7
8 9 2
6 2 5 3
9 8 7 1
Hard #3
3 7 8 4
7 3 1
1 6 4
9 2
4 5 8 6 1
3 7 1 9
2 4 3
5
5 1 8 9
Hard #4
9 7 2 6
1
3 7
3 1 9 7
5 3 9 4 2
1 6 7
4 7 8
2 4 8 9
7 2 1
Hard #5
9 6 7 4
1 6 5
8 2
4 5 3
8 2 4 3 1
6 1 4 2
1 8 6
5 7
2 4 1
Hard #6
4 8 2
4 2 8 7 6
1
3 6 2
8 9
5 3 7
5 7 1 2
8 7 3 2 1
1 9 5
Hard #7
4 1 2
9 8 5 4 7
1 2 6 9
1 8 5 9
8
9 7 2
7 6 8
6 4 9 1
5 2
Hard #8
2 8 5 3
2 1 9 7 6
7
2 4 1 8
3 1 2
4 8 9
9 2 1
3 2
9 4 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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