Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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