Printable Hard Sudoku

Set 1wxadp5. 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
9 7 4
2 1 7 6 8
4 2
3 1
5 4 3
3 5 9
7 8 9 2
5 9 3 1
4 8 2
Hard #2
2
8 5 1
1 6 4 8 3 2 9
4 6 3
8 4
8 3 4 6 1
5 4
6 1 8 5
3 9
Hard #3
6 3 8 5
8 5 9 6 2
6 4 9 3 2 8
6
8 2 5 1
7 1 6 4
1 9
3 8 2
Hard #4
7 4
4 7
9 8 1
1 2 5 8
8 4 7 3 2
3 8
4 1 8 6 5
5 9 8
9 7 2
Hard #5
3
9 7 6 1 2
2 4 1
1 4 9 3
5 6 4 8 9
7 4 5
5 1 7
5
1 7 4 2
Hard #6
7 9
6 1
5 6 4 9
9 4 3
4 6 9 1
7 2 5 3 8
6 3
1 9 7
3 9 7 2
Hard #7
7 1
7 6 5
6 8 3
5 1 6 9 8
2 9 3 1
7 9 3 5
1 2 4 9
7 4
8 5
Hard #8
9 5 1
6 7 5 4
7 4 6 8
9 4 2
8 1 9
2 9
3 5 2
5 4 3
3 1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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