Printable Hard Sudoku

Set 1vc7s2e. 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
7 6 1 9
2 5 3 6 8
4 3
6 4 7
4 9
8 2 9
9 6 8 3 4
1 3 2 6 8
Hard #2
6 1 8
2 1 4 9 7
7 2 5
1
5 3
2 8 1 4
4 1 7 5 6
8 4
9 8 6 1
Hard #3
3 7 2
7 5 6 9 4 8
9 8 7 6
7 5
9 3 8 7
1 4 3
2
3 6 7
7 8 1
Hard #4
4 9 7 5
6 5 8
5 1
2 1 9
8 6 3 4
3 9 6 8
6 9 5
4 6 3
5 8 9
Hard #5
5 6 4 3 2 1 7
9 6
3 9 1
7 4 6
1 6 9
2 5
2 7 5 8 9
9 2
2 8
Hard #6
1 7 8
3 1 8
5 7 4 2
4 6
4 1 9
1 6 2
6 2 7
4 8 5 1
7 2 9 4
Hard #7
3 5 7 8
1 2 3
7 2 6 5
2 1 8 5
9 5 6
6 1 7
9 1 6 2
4 5 1
3
Hard #8
2 4 7 9
8 3 4 2
3 9
9 4 5
4 2 9 5 1
8 1 2
1 9 8
2 9 6
5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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