Printable Hard Sudoku

Set hi4bw9. 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
1 2
4 8 6
7 9 8 5 2
1 2 5
2 3 9 6
5 1 7
3 8
7 4 9
1 9 3 7
Hard #2
1 6 7 8
5 2 1 4
8 4 2 9
9 8 5
9 4 7
2 8 6
3 4 6 1
7 9 3
3
Hard #3
8 7 1
6 8
2 5 6
7 3
9 1
2 9 6 5
1 8 3 5
7 6 1 9 8 2
4 7 9
Hard #4
6 7
5 1
3 6
9 2 4
7 9 8 4
8 6 5 2
1 9 7 6
4 3 7
5 7 2 8 9
Hard #5
2 9 7 3
6
1 3 8
8 1 5 4
9 6 4 3 7
2 3 1
8 5 7 4
7 5
6 9 2
Hard #6
2 6
6 4 5 9 3
5 8 4
7 1 4 3
2 9
7 9
3 4 8
8 5 7
6 8 4 2 9
Hard #7
5 8 2 1
8 2 4 9
4 6 9
5 6
9 8 2
2 9 6 3
5 3 7
2 1 5
6 8 1
Hard #8
5
2 1 6 5
4 1 8
6 3 8 9 4 5
3 9
7 8
8 6 3
3 5 9 1 4
4 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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