Printable Hard Sudoku

Set 1rpez0p. 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 8 4 2
6 1 5 7 8
4 9
6 9 7 1 5
3
1 3 9
8 6 9 4 5 7
1 8
2
Hard #2
6 5 8 3
6 7 9
4 9
7 2 6 8
8 5
3 2 5
8 4
3 4 8 7
8 7 2 9 3
Hard #3
7 5 8 4
6 2 7 4 9 3
5 1
8 6 3 1
2 7 9 3
1 9 2
8 5
7 3 2 1
Hard #4
4 9
4 5 7 3
6 9 3 8
8 7
7 4 3 8
2 8 1
1 5
5 7 6 2
9 7 6 8
Hard #5
7 6 3
4 8 6
5 7
1 8 4
4 1 9
2 7 8
4 8 6 9
8 7 4 9
3 8 5 1
Hard #6
3 8 2
8 1 4
3 1 4
3 1 6 9
4 9 1 5
6 9 1 4
7 6 5 3 1
1
4 6
Hard #7
9 6 8 5 3
2
2 4 9
7 8 9 4 6
4 8
5 1
2 9 4
7 6 2 3
8 1 3 6
Hard #8
5 3 6 7 8
9 2 3 6
2 5 8 1
1 6 7 2 3
9
7 1
5 9 2 8
8 4 9
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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