Printable Hard Sudoku

Set 15zmcxx. 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
3 7
5 6
3 6 5
2 1 4
1 8 3
5 8 7 3 1 9
3 9 1 2 6
8 2
1 2 4
Hard #2
6 7 9 8 3 5 4
6 3
7 4
5 8
4 1
3 6 5 8 1
5 6 3
4 7 9
9 5 1
Hard #3
9 2 4
6 3 9 1
2 6 4 3
1 2 5
2 8 3
8 4 5
9 3 7 1
6 8
4 8 1
Hard #4
9 2 4 1
6 1 3
8 5
2 3 6
1 8 2
8 9 7 1
6 7
6 9 1 2 7
3 9 6
Hard #5
4 1
2
7 4 1 8 2 5
3 6 9
1 2 3
8 4
9 7 2 5
8 4 5 3
2 5 6 9
Hard #6
3 2 7
5 8 4
6 2
2 4 7 5 3 8
9 6
5 9 1
7 5 3 2 4
3
9 4 3 5
Hard #7
2 9 4
6 9 7 8 3
4
5 8 4
1 7 8 6 2
3 6
2 4 5 7
7 6 9 2
8 1
Hard #8
7 4
3 6 1 2
4 2 7 3 5
6 5 8
9 4 5 6
1 4 6 5 3
7 5 4 1
6
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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