Printable Hard Sudoku

Set 1apg9hv. 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 2 4 6
4 5 1
8 5 4 7 9
2 8 4
6 4 2 7
3 6 8
8 4 6
4 5
9 2
Hard #2
4
9 5 1 6 4
7 3 5 8
6 1 8 2
4 2 5
3 7
1 8 4
3 4 9 2 1
1 8
Hard #3
3 7 5 8 1
1 9 8
7 5
5 8 7 1 4
3
2 3 6
9 2
2 3 5 8
1 2 9 4
Hard #4
9 1
4 5 6 8
3 2
2 7 8 3 5 9
5 4
8 1 2 7
9 4 6 3
9 1
7 8 2
Hard #5
6
5 4 7 3
7 2 6
6 4 8 2
7 9 3
2 8 9
6
4 5 6 2 9 8
8 5 3 6
Hard #6
8 1 6 2
5 7 9
6 5 4
8 7 1 5
3 6
7 2 8 1
6 1 5
4 3 6 8
7 2
Hard #7
1 8 6 7
8 9 1
3 4
3 2 7 6
5 6 1 9
7 9 3 4
5
9 1 8
2 3 4 9
Hard #8
9 1 5 8
9 3
7 5 1
5 1 8
9 6 7
8 2 4 1
5 6 9
2 7 6
9 3 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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