Printable Hard Sudoku

Set 172w2bg. 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 5 4
7 6 8 3 2
6 9
7 6 9 8
3 1 4 6
2 7
4 5 9
7 9 1
2 3 8
Hard #2
1 3
8 2 5 7
4 9 6
7 4 6
8 4 2
6 5 7 4 3
2 9 7
1 4
9 3 5 6
Hard #3
8 9
4 8
3 1 6 2
4 3 6 8 9 5
6 7 5 1
4 6
5 3 7 6 1
7
4 2 3
Hard #4
6 4 7 3
3 9 1 8 2
2 1 6
4 7 9
3
7 4 2 1 6
2 6 5
7
1 6 3 9
Hard #5
7 3 4 6
8 6 3 1
9 2 3 5
4 9 7 1 2 8
8
9 2 1
2 9 5
1 3 9 6
Hard #6
2 1 6 5 3
6 9 2 5
4 3 9 7
9
4 8
1 5 6
8 5 2
7 1 5
6 9 3 1
Hard #7
9 1 5
5 3 8 7 4
2 5
2 4 1 6 3
7 9
7 1 6
9 7
6 3 8 5
4 5 2
Hard #8
8 5 7 1
9 6 2
4 6 2 9
3 1 8 6 9
6 4 5
3 6
2 3 5
4 9 2
9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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