Printable Hard Sudoku

Set 1cx2dgr. 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
1 2 6 5
5 1 8
4 9 7
1 7 6
3 5 7 4
9
9
1 9 6 4 5 7
7 2 1 5
Hard #2
3 2 6 5
8 9 4
5 1 7
7 9 3
5 4 1 7
2 9 4
9 5 8 7
5 3 9
7 2
Hard #3
8 1 2
1 5
2 6 7
3 6 9
1 2 9 3 4 6
7 5 3
3 2 8
7 5 9
3 8 1
Hard #4
2 8 1
3 6 5
1
5 8 9 2
1 3 2 8
2 9 1 3 5
9 8 6
5 8 2
7 8 1
Hard #5
3 9 7 8
3 4 7
4 8 5 1
9 6
3 2 1 5
9 4 2
8 1 2
6 5 3
7 4 3
Hard #6
4 3 8
9 5 3 1 7
2 6 5
1 4
9 6 5
5 2 6
8 4 9
9 3
8 6 4 2 5
Hard #7
9 5
2 9 3
4 8 3 1
7 8 5
2 5 3 4
6 3 2
3 7 8
7 5 8
3 4 9 1
Hard #8
6 7 8 9
6 7
6 2
2 5
9 8 5
5 6 4
1 4 2 5 3
5 4 8 1 2
9 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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