Printable Hard Sudoku

Set 1c1q4n7. 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 1 5 6
9 2 3 5
4 3
9 4 3
3 1 8 9
1 7
6 9 1
8 4 5
2 3 5 7
Hard #2
5 4 8 6
7 2
9 6 7 8
8 1 7
5 1 6 9 3
3 9 1
2 1 4 3
9
7 6 5
Hard #3
8
4 7 5
3 5 6
2 6 9 3
9 7 8 1 2
4 2 1
9 5 8
2 8 7 3
5 1 4
Hard #4
7 8
8 3
6 2 3
2 6 3 5 1
1 5 8 4
1
6 9 5 1
1 8 6 7
4 6 7 9
Hard #5
4 1 2
9 5
8 6 7 9
6 4
2 4 9 7 5
3 7 2
4 1 2
5 9 2 6 8
6 4
Hard #6
1 2 9
3 5 6 1
5 3
5 6 8
8 4
9 8 7
2 3 1
5 8 9 7 3
4 2 8 9
Hard #7
6 8 1 7 4
8 2 6
3
1 8 7 5 2 4
5 4 3
7 6 1
1 7 5 9
9 6 4
6
Hard #8
7 1
1 3 5 9 4
9 6 7 2
2 8
9 3 8 5
1 5 6 3
4 5
7 3 6
7 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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