Printable Hard Sudoku

Set 17y2twe. 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 9
1 6 4
6 3 2 5
9 5 2 3 8
4 8
6 9 2
4 9 6
6 1 5 8
8 1 3
Hard #2
1 6 5 9
2 3 8 7 1
2 7 1 8 5
8 9 2
5 2 1
3 4
9 1 8
7 1
4 2
Hard #3
5 1
8 9 4
4 9 2 5
7 5 2 8
9 4 2 6 5
1 6
3 4 6
2 4 9 1
7 6
Hard #4
7 6
5 9 7
7 8 2
5 1 8 4
3 8 9 5
2 7 4 6 8
2 9 6
5 3
9 7 2
Hard #5
1 5 9 8
7 9 8 1 5
8 4
3 9
6 5 8 3
8 2 4 6
9 7 5
5 8
1 5 3
Hard #6
7 4 3 2
9 2 8
5 7 4 6
8 7 6 4
2 5
5 2 9
5 3 4
7 4
4 1 9 3
Hard #7
7 5 9 3
2 6 4
3 4 2
6 4
1 8 7 4 5
6 4 9 5 3 8
2 7
6 9
3 1
Hard #8
2 5 1 6
6 1 3 9 7 2
9 4 1 6 8
7 4 2 3
5
3 1
6 9
4 8 7
4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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