Printable Hard Sudoku

Set 17tkg3f. 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
4 2 7 9 1
8 4 6
1 9
8 4 1 2
3 1 7
9 3 6 1
5 8 4
8 4 7
3 6
Hard #2
7 9 1
8 2 6 9
2 1 5
3 5 9 8
1
7 6 8 4 3
5 2 8 3 7
4
3 6 7
Hard #3
2 3
3 8 7 6 1
5 1 4
2
8 3
5 2 4 1 9 6
1 3 2
1 5 7
9 3 6 2
Hard #4
6 4 9 8
4 3 7
9 8 7
1 4
7 2
8 6 9 2 7
5 4 7
6 5 7 9
2 8 5
Hard #5
4 7 5 9
5 2 3
4 2
5 7 1 4 2
6 9 3 5
3 1 9 4 2
9 4 5
6 7 8
Hard #6
8 1 7 9
5 7 6 2
4 8
1
4 1 6 9
3 5 2 8 4
8
1 7 3 5
9 3 5 6
Hard #7
1 4
6 4 2 5 9
3
8 5 9 7
6 2 1
5 7 6 2
3 6 7 8
9 6 5
5 3 2
Hard #8
9 5 6 7 2
1 2
4 1 6
7 4 2 6
1 6
9 3 5
6 3 1 7 4 9
3 9
8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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