Printable Hard Sudoku

Set 1d7y4q4. 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
9 3 8 6
5 2 7
3 4
3 1 8
9 7 5
1 9 3 2
2 9 6 4
8 5 9
9 8 1
Hard #2
3 9 1 6
3
7 6 5 8 9
3 2 6 1
4 7
8 7 5 1
4 7
7 1 3 5
6 4 2
Hard #3
9 8 2
7 9 5
5 6 7 8
1 8
9 3 6 1 2
6 5 2
5 4 6 7
4 8
8 6 4
Hard #4
4 3 9 1
8 7 6 4
9 5 6 7
2 6 7
1 7 8 9
6 3 1 4
1 2 3 5
5 3
Hard #5
1 3 7 9 6
5 6 2 8
2 9 3 7 1
9 7
7 2
2 6 8 4
9 4
8 5
7 3 5
Hard #6
2 7 6
2 6 1 9 5
1 3 5 4
3 4
7 6 8 9
6 8 1 3
8 6
5 2 6
3 8
Hard #7
9 6 2 4 5
8 4 7
1 9 7 8
1 4
7 9
2 3 4 6
7 6 8
2 4
5 3 9 6
Hard #8
9 5 7 1
5 6 2
2 1 8 5
2 8
6 8 2 9
3 4 7 6
8 3 1 6
3 6
9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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