Printable Hard Sudoku

Set 1g17oet. 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
8 5
6 2
9 5 2 1 8 7
4 1
1 6 9 3 4
3 7
4 5 8 2
9 7 3 4
7 6
Hard #2
7 9 1 2
9 7 1 4
1 8
8 1
5 7 3 6
3 4 8 7 5 2
6 9
7 4 3
2 3
Hard #3
6 8 7
2 1 8
7 6 4 5
2 4 9 8
4 8 2
1 7 4
5 8 3
3 1 7
6 3 1
Hard #4
3 9 4
6 4 8 7
1 4 2 3
9 8 5
5 3
9 7 1
3 5
9 2 4 5 8
2 4 9
Hard #5
1 2 4
8
8 3 9 1
9 8 5 2 7
6 7 3 8
3 5 6 2 9
3
4 8 1 2
3 9
Hard #6
2 4 5 9 3
8 3 7 5 2
8 2 3 7
8 4
3 1 9 2
1 5 9 6 4
6 8
7 6
Hard #7
4 7 8 2 1
5 2
9 6 1
7 9 1 3
6 4
1 7 2 6
5
3 1 9 6 4
9 7 8
Hard #8
2 5 4 6
3 5 4 1
6 8 1 5
1 8
7 5 1 6
8 9 3 7
9
3 4 8 6
2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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