Printable Hard Sudoku

Set 13sfrwq. 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 6 8
7 3 4 5
8 5 1 6 9
1
9 8 5 6
2 7
1 4 7
2 9 4
6 8 1 9
Hard #2
2 4
7 9 1 6
1 6 2 7
8 6 5 9
2 9
6 4 2
8 4 3
5 3 9 8 6 1
4
Hard #3
9 1
8 7 3 6
1 4 2
2 8 6
6 7 8
1 6 2 4
4 9 6 5 8 3
3 4
5 9
Hard #4
8 1 3
7 9 6
1 9 4 6
7 5 2
3 4 8
9 8 7 4
6 5 4
1 2 7 5
8 5
Hard #5
1 9 5 2
6 3 1
4 9 8
1 9 5 2
3 6 1
4 2 3 5
7 1
5 6 3 7 8 4
Hard #6
6 1 5
1 4 9 8
5 4 2
6 1 8 4
2 4 6 3 8
3 5 7
6 1 2 3 4
4 6
Hard #7
6 3 4 2 8
8 7 4
9 3 1
5 2
4 8 6
6 8 3 5 4
2 8
1 6 7 4
4 3
Hard #8
5 1 9
9 3 6 5
2 1 4
8 9 3 7
9 4 5
3 6 2 7 8
1 9 5
7 1
6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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