Printable Hard Sudoku

Set 17dqxub. 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 8 6
5 6 9 4
7 1 9
7 9 5 2
5
4 9 1 6
1 6 3
4 7 1
8 4 9 3
Hard #2
5 7 3
9 3
6 8 2
2 7 3 8 5
3 5 8 1 4
6
1 7 5 2 4
8 1 5
3 7
Hard #3
7 4
2 3 8
6 5 3
2 8 1
8 3 5
9 7 1 6
1 8 9 7
4 1 2
2 7 6 4
Hard #4
8 3 9
6 9 7
2 8
4 5 8
3 2 5 7
5 6 7 3 2
8 1 6
4 2 7
6 1 2
Hard #5
3 2 1
8 2 3
1 7 8 4 2
8 2 5 3
6
5 9 4 8
3 6 7 4 2
1 5 7
1
Hard #6
8 7 9
3 7 1
7 4 6 3 2
5 8 2 9
8 7
2 5 6
5 7 9
2 4
4 6 1 8
Hard #7
2 5 4 6
9 7 2
1 6 9 2
1 3
2 9 7
2 9 4 8 1
3 7 9
8
8 2 6 3
Hard #8
7 8
1 2 5 4
6 3 5
6 8 4 3 5
4 9
9 6 7
9 2 7
5 7 4
1 8 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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