Printable Hard Sudoku

Set 18o1h62. 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
9 8 4
8 6 7
5 7 6 2 1
8 6 7 4
1 7 8 5
4 9 1
9 6 7 2 8
3 2
Hard #2
6 3
8 4 9
8 7
1 7 9 6 2
2 5 4 9
5 4 1
7 5 8
1 5
4 6 8 7 3
Hard #3
2 5
4 3 1 6 8 7
7 6 9
2 8 1 7
5 2
6 8 4
7 3 5
1 4
3 9 4 6
Hard #4
4 9
3
1 4 8 2 3 6
1 6 3
8 5
8 5 4 1
9 7 5 2
5 6 8
3 2 6 4
Hard #5
2 3 5
6 1 7 3
5 6
2 9 1
1 2 3
9 5 3 2
4 7
8 1 4 2
1 9 4 5
Hard #6
2
1 8 3
4 7 6 5 1
1 4
6 7 5
8 1 5 7 2 9
9 2 4 5
1 2
2 1 7
Hard #7
7 3
4 9 8 1
1 3 8 6
2 8 6 4
5 9
6 7 1
6 8 7 4
3 7 5 1
2 5
Hard #8
2 4 5 1 3
8 1
6 7
5 8
6
7 2 9 5
5 2 8
4 3 1
6 2 8 5 3 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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