Printable Hard Sudoku

Set 4w1csi. 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 8 6 5
6 3 5 2 1
9 4 5 6
4 1 3 8
1 2 4 7
3
3 1
7
9 5 4 3
Hard #2
8 4
4 1 2 5
1 3 6
2 1
3 5 9 8 4
7 4 6
4 2 9 8
5 2 1
6 8 7
Hard #3
5 4
3 5 7 8
6 4 2
7 1 9 5 3
6 7 4
4 3 2
3 7 6 4
8 9
8 9 6
Hard #4
1 6 3
9 6 5 8 2
8 4 9 5
6 3
5 7 1 3 8
4 8
7 2 5
5 8 3
6 3
Hard #5
8 5 2
6 3 1
1 9 4 6 3 5
1 7
7 6 1 4
8 5
6 3 4
9 8 2 4
5 6
Hard #6
5 7 2 9 8
1 5 4
1 7
8 6 5
4 1 6
6 4 2
5 2 8 9
2 1
8 4 7 3
Hard #7
6 9 4
5 4 1
3 2
1 6 7
8 3 2 7 1
2 4
2 6 9 1 3
5 3 7
4 1 8
Hard #8
7 3 4 5
8 6
5 7 1
1 5
5 6 3 4 1
7 8 3
2 3 1 4 8 7
9
6 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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