Printable Hard Sudoku

Set 1sr3gfv. 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
4
2 4 5
7 5 3
1 9 7 8
7 4 9
4 7 9 3 1 2
5 7 3 6
8 1 6 2
2
Hard #2
2 7 5
6 8
7 6 4 1 2
7 8 9
3 6
9 4 2 3
5 8 1
9 2 8 7
2 5 4
Hard #3
7 6 8
3 8 1
8 7 5
6 5 1 2
4 2 9 5 6 3
6 9
8 7 5
5 2 3
4 2
Hard #4
7 1 4 5
1 3
6 8 1 9
4 5
6 1 5 3
9 7 1 8 5
8 2
5 7 9
4 3 9
Hard #5
7 4 9 5 3
1 2 6 9 8
2 7
9 3 8 6
8
1 5 7 9
6 4 3 1
6
9 4 5
Hard #6
1 2 7
6 8 1
5 6 8
4 9 2 3
6 4 8
7 5 9
5
3 7 8 4 9 1
9 3 7
Hard #7
7 2 6
4 9 7 1
5 1 4
1 7 5 6
7 3
4 3
9 8 5
4 8 1 3
6 9 3 8
Hard #8
9 8 1 7 4
8 2
1 7 2
4 7 8
7 6 9
6 1
4 8 7 9 1
6 3
2 8 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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