Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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