Printable Hard Sudoku

Set 1sxpe7r. 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 4
2 3 5 1
3 8 6 2 9
2 8 7 4
4 7
6 8 3
7 1
8 4 5 2 7
9 3
Hard #2
7 9 2
2 3
7 6
9 2 5 8
5 9 3 1 2
1 2 7 6 4
7 1 3
4 5 8 6
2
Hard #3
2 9 3 8
9 8 1 6
7 5 6 1 9
3 5 1
5 4 9 2
4 2 6
2 6 7
6 4 9
Hard #4
2 8 6
1 3 2
1 5 4
7 2 8
7 4
5 9 3 1
6 1 9 5
1 9 6 4 7
2 4
Hard #5
3 6 1 4
4 7 5 9 6 8
7 3
9 3
6 1 8
4 7
6 3 1
9 3 7
2 4 7 6
Hard #6
8 7 9 3 4
3 5 2
2 9
7 4 1
8
9 2 1 5 7 8
2 1 3 9
4 8 6 9
1
Hard #7
5 2 6
9 7
7 1 2
4 1 6
5 4 7
4 8
3 9 2
9 8 2 6 3
1 7 4 8 3
Hard #8
6 3 8 2
9 7
3 5 4
6 9 4 2 1
8 3 1 6
1 9 8
3 9
7 2 1
4 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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