Printable Hard Sudoku

Set 1gor717. 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 9 5
8 4 5 3
7 9 1 4 6
5 8 7 9
4 9
2 6 1
9 4
2 5 7
4 6 8
Hard #2
7 6
8 7 5 3
9 3 4
4 8
8 2 1 3
9 7 6 5
3 1 5 8
5 6 1 4
2 9
Hard #3
4 2 9 5 7 8
2 3
7 6 2
1 4 6 8 5
2 8
3 9 7
7 3 8 1
1 3
9 5
Hard #4
6 2 4 1 7
2 1
1 9 2 5 8
8
4 7 1 3 6
5 6 9
4 3 5 7
7 9 3
9
Hard #5
3 9 6 5 8
8 4 7
1 3 2
6 7 5
6 4 2
5 7 4 3
4 5 8 6
4
3 9 2
Hard #6
4 5 1 8 7
1 9 6 8
5 4 2
6 7 4 5
6 3 1
2 6
3 9
8 2
6 7 5 3
Hard #7
2 1 3 9
8 9
5 1
2 1 9 6
8 2 4 3 5
4 7 8
9 4 2 7 8
2 6 4
7
Hard #8
8 5 3 2
1
3 8 7
6 1 2 4
7 1
9 2 4 6
3 4 8 1 5
2 6 9
3 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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