Printable Hard Sudoku

Set 1h72zok. 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
8 6 7 2 1 4
8
2 6 1
7 9 1 8
2 6 1 3 7
4 5 2 6
3 8 5
8 6 7
Hard #2
9 8 7 2 4 5
8 6 3
5 1 2 7
7 1 8 3
8 1
7
9
8 2 5
2 4 7 5 6
Hard #3
1 7 9 4 5 2
9
6 1 7
3 6 2
8 5
3 4 8
2 5 7 3 8
9 2 5 7
3 5
Hard #4
1 3
1 9 3 4 6
2 4 8
3 2 8 4 9
5 9 1 7
4
2 9 4
6 5
1 5 3 2
Hard #5
7 1 8
9 2
3 6 4 5 7
5 9 7 2
6 3
6 2 7
8 3 7
4 1 5 3
9 2 6
Hard #6
2 3 8
1 5 2
6 3 4
4 3 2 9
6 7
9 7 1
9 1 3 5 6
2 8
7 6 9 2
Hard #7
5
5 1 3 4 2
3 2 9 5
8 6
9 6 3
5 9 2 7 1
6 8 3
5 9
2 4 3 6
Hard #8
1 4 2 9
5 6 3
5 2 6
2 8
9 2 1 3
3 6 7
6 1
1 5 4
8 9 2 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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