Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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