Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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