Printable Hard Sudoku

Set szcjb4. 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 5 2 7
2 9 3
6 2 1
4 5 6 1 8
2 4
6 8 4 1 2
3
7 3 4 5
3 6
Hard #2
2 6 4 3 5
3 1 4
5 7 9 6
5 3 9
9 7 6
3
1 8 2
4 7 3 6
6 7 5
Hard #3
5 4 1
9 8 2 6
1 8 3
3 7 4 5
2
1 4 5 8
6 8 4
4
8 1 2 4 3 6
Hard #4
5
9 8 3 4 2 1 5
4 7
1 9 5
6 9 7
3 2 7
7 6 4
3 4 8 7
5 1 3
Hard #5
3 9
1 5 6 3
7 5 8
8 5 1
2 8 7 3
6 5 7 4 8
5 1 9
1 7
5 6 4
Hard #6
8 2
7 4 9 3 2
5 2 8 7 3
1
7 8 2 5
2 1 3
4 9
3 5 1
4 3 1 6
Hard #7
5 1 8 2
4 9 3 7 5
8 7
7 5
9 2
1 5 9 3
1 9 5 8
8 4 6 5 1
6
Hard #8
6 1 7 9
5 8 1
1 3 2 6
7 8 4
2 4 5
9 6 1
6 1 4
9 2 7
6 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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