Printable Hard Sudoku

Set j4p9p4. 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
2 3
8 6 4
9 3 8 5 6
6 8 2 7
2 1 3 4
6 9 8 7
9 1 8 6
7
Hard #2
9 5 1 6
6 5 7
7 9 4
5 7 3 8 2 1
2 9 1 6
8 9 3
2 8 6 7
6 4
Hard #3
8 5
9 3 7 4
3 6 2
6
8 4
2 4 5 8 3 9 1
7 8 4 9
6 1 9 5 7
9
Hard #4
1 9 6 4
7 3 8
8 1 7
2 4 5
7 5 8 6
3 2 1
4 3 9
3 2 9
8 1 4
Hard #5
4 7 8 6
9 8 4
3 5 6 1
2 8 1 3
1 5
7 6 8
1 2 3 8
7 3 9
9 6
Hard #6
9 6 5
1 9 7
2 7 1
4 3
5 9 8
1 3 8
6 2 8 9
8 7 5 2 4
9 4 6
Hard #7
5 6 9
6 4 5
1 2 3
4 2 8
2 8 9 1 5
1 7
3 5 4
4 9 6
9 3 1 8
Hard #8
4 7 5
6 5 7 9 1
9 6
3 7 5 4
1 4 3
2 6
4 2 5
1 4
8 6 4 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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