Printable Hard Sudoku

Set 19l9l6y. 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 8 3 4 5
2 8 7
8
7 5 2 8
9 7
5 3 6 4
5 2 4 1 9
2 4 7
1 6
Hard #2
3 2
8 5 2 7 9
6 8 9 5
2 4
5 6 4 8
7 6
1 6 4
3 4
2 7 3 5 9
Hard #3
7 6 5
8 9
3 8 4 9 2
9 7 6
1 3 4 2
5 2 7
2 4
5 8 4 6
7 5 4
Hard #4
4
1 7 4 9 3
6 7
6 2 3 5
7 5 6 2
1 7 8
6 9 1 4
3 5
2 9 7 5
Hard #5
9 2 8 7 3
3 8 1
6 4
7 6 8
2 1 9 4
6 2 7 9
1 6 5 2
3
3 4 9
Hard #6
1 5
4 5 9 6 7
3 5 4
1 4 8
2 8 1
3 4 5
1
8 4 2 7 9
2 6 3 4
Hard #7
8 5 6 1
4 3 8 7
7
2 5
1 2 9 4
7 9 1
7 4 6 9
2 4 3 5
8 2 1
Hard #8
4 5 1 2
1 4 9
9 3 2 1 8
9 7 1
1 4 2 8
8 6
6 1
7 4
4 1 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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