Printable Hard Sudoku

Set 1h51lai. 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
4 1 9
6 3 9
8 2 3 6
7 2 6
5 4 1
8 5 1 3 2
7 2 1 6
1 7 8
Hard #2
8 4 2 6
9
7 8 1 2
7 6 1 5
3 8
6 2 1
8
2 5 9 4 3 7
6 7 5 9
Hard #3
6 4 8
8 9 1 5
9 7 2
5 8
4 8 6 9
2
9 8 1 4 5 7
1 4 8
5 6 3
Hard #4
2 8 9
8 1 2 7 5
6 4 5
6 9 1
5 2 3 7
3 2 6
5 6
1 5 3 4
2 1
Hard #5
5 6 2
9 6
8
5 4 1 7
9 2 3 4
2 3 8 6 5
4 3 1
6 7
2 7 9 1 5
Hard #6
1 3 5
8 6 9
4 7 9 5 6
3
8 7 6
6 7 2 1 5
1 3 2
6 9
1 6 4 8
Hard #7
7 8 4 3
4 9 5
5 2 9
8 1
5 1 6 3 8
9 3 2 1
7 3 2
7 2 1
1 8
Hard #8
8 3
2 9 4
3 9 6
6 9 1 5 4 2
5 9 4 3
6 5
7 4 3 8 1
6 1
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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