Printable Hard Sudoku

Set 1akysj2. 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
1 3 8
9 2
7 9
2 5 4 8
4 3 1
8 1 2
2 9 5 4
1 7 5 8 9
9 6 1
Hard #2
3 2 6 1
2 6 7 5
5 8
7 3 5 1
9 4 8
1 4 7
5 4 2 6 1
1 3 8 7
Hard #3
6 7 5 4
2 8 6 4 1
3 2 6 5
3
7 4 6 9
9 5
6 1
4 1 8
3 9 2 8
Hard #4
6 8 9 2
3 5
7 5 1 6 9
7 5 3
1 2 8
8 6 1 9
9 7 8
2 3 9 8
6
Hard #5
4 6 3
2 1 5
5 8 6 7
1 8 4
8 2 4
4 7 6 2
3 5 2 1
6 8 3 9 7
Hard #6
1
5 7 9 2
4 6 9 1
6 3 8 5
2
2 4 1 9
8 6
9 1 5 6 8
6 8 4 9
Hard #7
5 3 1
2 3 5
8 2 5 9
4 6 8 7 3
3 9 8
9 5
1 9 3
7 1 6
6 5 8
Hard #8
5 4 2 6
2 1 6 5 9
4 2 3
3 8 1 5
6 5 4
8
6 2 4 1 9
7 8 6
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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