Printable Hard Sudoku

Set 1cihr0p. 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
5 1 8
2 1 5
7 6 1
1 6 5 9
2 8 6 5
8 3 7 4
2 1
4 9 7
9 8 6
Hard #2
9 8 7 4 2
4 9 3
3 2 8
5 8 3
7 9 3 1 5
9 8 6
8 7
5 9 3
6 4
Hard #3
9 5 4 3
6
5 7 4
5 6 2 9 1 7
5 3
7 8 9 6
4 3 6 5
8 1 3 7
4
Hard #4
4
5 9 3
8 6 7 2 9
9 4 3 5
4 9 6 1
7 8 4
3 9
7 5
7 6 4 9 8
Hard #5
6 4
9 8 6 2
2 1 3
2 7 4
5 4 9 1
1 5
4 8 3 2 6
6 3 7 2 9
6
Hard #6
3 2 4
2 3 4 5
1 9
5 3 6
7 8 1 4 5
2 1 5
1 3 8
4 9 7 8
7 6
Hard #7
6 2
3 2 9 6 4
4 8 1 6
8 7 5
2 5 4
7
7 6 3
9 5 1
4 6 5 8 7
Hard #8
1 2 6
2 6
1 6 4 8 7
3 5 7
8 4 7
3 8
8 5
7 3 4 9 5 8
6 3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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