Printable Hard Sudoku

Set 1nkain7. 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 4 1
1
4 6 8 5
8 9
2 7 6 5
6 1 5 9
1 9 5 4 6
8 6 5
4 9 7
Hard #2
7 3 6
5 9 8
4 2
1 8 2
4 2 6 9
1 5 7 4
3 6 1
9 2
6 9 5 3 7
Hard #3
2 7 1
6 8 7 1 2 5
9 8
8 1 4 5 2
3 6
5 4 9
2 5 3
8
7 5 2 8
Hard #4
6 1 7
3 2 4
7 1 5 4
1 5 4 6 3
4 3 2 5
5 8 1
4 3
9 5
6 7 9
Hard #5
8 3
4
3 6 9 8 7
7 1 9 3 5
4 8 6 7
9 2 4
8 9
9 1 3 8 4
5 7
Hard #6
9 6 1 3
4 7 1 9 5
5
9 2 5 8
3 6 9
6 1 3 5 2
6 2 5
4 2
2 7
Hard #7
8 9 5
5 7 3 4 6 2 9
6 2
8 3
4 7 6
1 7 8
9 3
1 7
7 2 5 9 8
Hard #8
3 9 2
7 6 3 2 5
2 8 1
8 2 4
1 7
2 9 6
8 3 5
1 6 8
9 1 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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