Printable Hard Sudoku

Set 271ate. 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
7 6 8 9
4 7
5 9
1 6
1 6 7 3 9 2
2
5 3 4
2 7 5 8
3 1 6 7 9
Hard #2
9 5 8
2 7 6
3 4 7
4 5 1
7 2 4 9
1 5 2
6 7 1
3 6 5 2
5 9 3
Hard #3
3 1 5
2 6
1 7 3
3 7
6 8 5 2
2 7 4 6
1 4 7 3 2 9
5 3
6 2 8
Hard #4
2 3 9 7
7 6 2
5 1 9 2
3 4
6 7 3 1
9 1 2 7
6
7 8 3 6
7 8 5
Hard #5
6 8
4 3
1 8 2 5 7
6 1 9 4 2
5 7 1 6
4 8
6 3 4 5
5 7 9
9 7
Hard #6
4 2 9
3 6 5
1 6
9 6
1 7 8
4 7 5 1
4 2 3 9
2 1 7
9 4 6 2 5
Hard #7
5 7 1 2 3
1 8
9 1 6
9 6 4
2 7
5 3 4
1 3 5 9
2 4 9 5 1 6
2
Hard #8
4 6 5 2
7 3 1
4 5
3 2 9
1 7 4
7 4 5
4 3 8
5 6 9
2 9 1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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