Printable Hard Sudoku

Set 1wi7f3w. 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
8 6 9 4 1
4 5
9 6
7 3 6
3 8 2 6 5
6 5 8
7 9 8
3
4 3 7 6 9
Hard #2
6 3 1 7
7 4 5
6 5 2
8 2 7 9
9 8 3
2 3 8
9 3
1 3 2
3 4 7 6
Hard #3
5 8 9 4 3
4
7 2 3
7 9 1 6
1 5 7
2 4 3
3 8 6
5 7
4 8 5 2 1
Hard #4
7 3 5 4
6 5 9 1
4 3 7
6 5 2
5 1
2 1 5 7
4 8
9 2 7 4
1 3 2
Hard #5
6 5 4
1 9 7
2 1 6 8 9
4 5
8 5 7 1
7 9 5 3 2
9 6 3 5 7
3 4
Hard #6
3 6 5 1
9 6 2 4
2 5 8 9
2 4 3 8
2
8 7 4 5
2 5 6 7
7 4 2 8
Hard #7
7 8 4 3 1 9
6 4 5
3 8 7
7 9
4 1 6 8
2 4 6 1
9 8 4
6 2
5 3
Hard #8
6 1 5 7 2
7 5 2 4
4 1 6 7
4 6
9 2 3
9 8 5
1
3 8 7
4 2 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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