Printable Hard Sudoku

Set 1rj6y0b. 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
2 8 1
3 2
2 3 5 6 4
4 9 5
2 5 9 6 3
1 4
7 9
7 2
5 9 4 6 1
Hard #2
9 4 2
2 1 7 6
7 4 5 3
8 1 3
6 7
3 5 9
4 8 3
6 5 7 4
5 3 6
Hard #3
5
9 8 4 6 5
3 9 2
7 6 9
8 9 7
4 3 7 6
1 2 8 4
5 3 8 9
7 5
Hard #4
8 2 5 1
7 4
5 4 9 7
7 4 8 2 3
1 9 3 6
8 9
6
2 1 8
1 6 9 4
Hard #5
6 5 8 7 3
3 2 4 1
2 3 8
4 7
9 4 6
7 9 6
8 5 4 3
2 5 9
3 8
Hard #6
3 6 1 2 7
2 7 1
7 6
9 2 3
8 7 4 6
1 5 9 6 3
4 8 7
2
3 1 8
Hard #7
4 1 5
2
2 8 1
7 5 6 8 4
2 1 4 9
2 6 5
4 2 3
8 6 9 7 1
3 5
Hard #8
3 9
6 9 7 5
1 3 4
2 8 7
6 5 4 3
7 6 8
4 8 6
4 8 7
9 7 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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