Printable Hard Sudoku

Set 1vd1cb8. 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
5 2
6 8
9 7 1
3 8 6 7
7 2 5
4 7 2 8
7 2 1 6 5
2 4 7
5 3 7
Hard #2
8 9 2
6 3 7
7 5 8 4
8 5
6 4 7
4 8 3
9 5 2 6 8
1 9 2
2 4 1
Hard #3
2 4 3 5
5 4 7 2 8
8 6 2 5
5 9 2 4
8 9
2 6 3 1
6 3
1 5 6 3
Hard #4
8 4 9
5
4 8 7 2 3
4 9 2 5
6
2 3 5 1 8
1 2 8 3
4 9 6
7 4 5
Hard #5
3 2 5
2 6
5 6 1
8 1 6
7 5 2 9 3
2 1 6
1 2 5 4
3 4 9
8 3 7
Hard #6
7
9 3 1
8 6 5
9 3 8 2
7 5 9 8
1 7 4
6 5
2 5 6
4 1 9 8 3 2
Hard #7
8 4 1 9
2 8
4 3 1 5
5 6 9
6 2 3
7 1 9 5 8
8 1 7
7 3 5
2 8
Hard #8
5 4
1 6
9 7 1
8 4 5 9
3 8 4
9 5 2 3 1
3 1 7
2 7 4 9 5
2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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