Printable Hard Sudoku

Set 167deui. 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
5 8 4
3 7
2 7 1
4 2 8 7 5
9 2 6
2 4 3
9 6 5
5 9
4 8 1 7 2
Hard #2
5 4 9 3
8 2 1 9
9 2
1 4 2 7
3 9 7 4
8 6 9
8 1
7 8 5
9 4 6
Hard #3
2 7 3 9 8
5
5 8 4 1
3 2 6 4 8
9 8 7 2
1 5 4
2
3 1 7
4 5 1
Hard #4
9 6 4 7
6 8 3 9 5
2 1
3 4 1 7
2 4
2 9 8 5
8 4 9 1
3 7 8
1
Hard #5
4 9 7
2 7 6 3
7 4 5 9
7 1 5
2 1
2 8 4 7
8 9
1 2
1 9 7 3 6
Hard #6
8 3
6 3 1 5
4 2 6 8
7 6
7 9 5 8
1 5 2 7
6 8 1
3 1 4 7
2 9
Hard #7
6 4 5
5 6 9 7 4
3 4 1
7 4
8 9 3 1 2
1 4 2 8
8 2
7 3
9 5 1
Hard #8
9 4 2 7
2 3 5
5 1 9
3 6 1
9 7
5 2 4
4 7 8 3
1 6
7 6 4 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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