Printable Hard Sudoku

Set 1ww9x5f. 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 5 3 1
9 1 2
8 3 6
1 6 9 2 4 3
3
4 6 1 8 2
5
8 7
4 1 9 8
Hard #2
5 4 3 8
3 6 5
6 1 4 7
2 5 7
7 4 3 6 5
3 8
2 1 7
2 5 4
9 2
Hard #3
9 1 2
5 4 3 2 9 8
7 2 5 6 4
9 5 7 1
9 6
6 7
4
4 7
3 9 8 5
Hard #4
5
8 6 1 4 7
5 9 6
4 2 5 1
3 4
5 2
4 8 9 3
2 6 3 7 4
9 1 6
Hard #5
1 5 8 6
9 5 3 6
2 8
7 9 8 3 5
3 1 4
8 1 4 2 3
9 6 5 1
7 6
Hard #6
8 4 5
1 6 4
5 7 9
5 4
3 8 2 4
7 6 3 1
5 2 1 6 3
3 2 8
9 3
Hard #7
3 1 6 9 8
2
9 3 2 8 6 5
9
8 2 6 7
6 7 4 9
2 4 7 1
4 8
9 3
Hard #8
8 1 2
2 7 6
5 1 3
7 9 3 8
3 2 4 9
8 5 4
7 9 1
9 2 1
8 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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