Printable Hard Sudoku

Set 1o0f5dv. 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 1 9 7 6
2 4
1 7 6 2
8 9 4
6 5 8 4
5 3
8 9 6
3 1 9
7 6 8
Hard #2
2 4 7 9
4 9 1 7
1 6 8 5
7 8 5 2 3
9
7
6 1 5
8 5 9
5 6 8 2
Hard #3
5 9
7 2 6
9 7 8
5 2 4 9
8 2 1 9 3 4
1 6
2 8
4 5 1
3 8 2 7
Hard #4
1 4
8 2 6 3
9 4 5 2 8
2 4
1 3 6 9
8 9 2
5 9 7
6 4 3
7 2 4
Hard #5
9 1 2
4 8
2 7 6 4 5
8 6 9
4 8 6
9 3 7
5 2 1
2 8
7 6 1 8 5
Hard #6
7
7 1 9
9 6 2 4
6 5
1 5 7 9
6 2 1
9 6 5 7 2 3
1 8
7 1 3 8
Hard #7
6 3 7 5
2 6 4
5 8
4 3 2
3 8 1 2 5
9 8 7
1 2
3 4 1 5
6 9 1
Hard #8
3 7 8 1
2 1 6
1 6
6 7 1 5
9 8 5
8 9
7 4
4 9 5 1 3
3 2 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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