Printable Hard Sudoku

Set 1svk10p. 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
5 9
6 8 7 5
2 7 3
4 3 2 8
6 4 8 2
4 1 9
5 9
2 1 3 6 7
Hard #2
9 4 2 8
6 3 5 7
2 1 9
5 7
6 4 7
8 5 6 3
5 4 7
8 9 2 3
6 1
Hard #3
6 5
1 4 3
7 4 2 9
8 2 4 7
3 2
4 5 6 7 8
4 6 3 9
9 6
7 1 9
Hard #4
9 6 7
1 2 4 3
3 8 5 4 1
2 6 5
7
4 5 9 2
7 4 8
4 9
8 3 6 4
Hard #5
7 4 5 3 1 6
6 3 4
1 2
8 5 1
4 5 8 9
6 2 3
8 7 6
5 7 2 1
3
Hard #6
7 4 3 2
5 9 4
5 3 9 8
2 7 5 6
8 9
3 7 5
3 1 8
4 8 7
2 3 4
Hard #7
4
9 4 6 5
2 5 8 3 9
7 1
6 3 5 2
9 4 7
5 6 9
8 4 7
3 2 1 4
Hard #8
5 4 7
3 4
9 1 5 8 6
8 2 7
6 5 9 4
9 7 1
8 3 1 4
1 2 5 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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