Printable Hard Sudoku

Set 15guoyi. 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
3 2 8 6 1
5 1 9
7 1
2 8 3 7
6 4 8
2 5
5 8 6
9 5 2
4 6 9 7
Hard #2
3 9 1 8 7
3
5 4
8 5 4 2
5 3 1
7 2 4 9
3 9 2
1 6
2 7 1 8 3
Hard #3
6 2 3
5 1 8
3 8 9 7 4
3 2
7 4
9
4 8 7 1
9 4 8 3 2
1 6 5 4
Hard #4
5 2
1 6 5
1 7
2 3 8
8 3 9 5
4 2
8 7 5 9
6 9 4 8 2
4 5 3 8
Hard #5
9 4
1 9 7
2 1 8 4 3 9 6
6 4 2
6 5
4 3
7 1 3
6 8 5 7
3 4 9
Hard #6
8 2 4
1 3 8
8 7 4 1
7 5 6 3
9 7 5
3 5 7 1
2
4 8
5 8 1 2 7
Hard #7
3
6 8 1
8 7 6 5 1
2 7 3 5 8
7 8
8 4 3
4 7 8 9
7 3 1
3 4 1
Hard #8
2 4
8 6 3
7 8 5
4 2 1 9
3 9 8
5 6 7 4
5 2 1
3 8 9
9 5 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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