Printable Hard Sudoku

Set 1nko1b3. 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
3 7 1 9
5 8 4 1
2 9 3 7
8 3
2 1
8 4 2 5
9 3 4
1 4 7 8
8 2
Hard #2
8 9
4 3 6 2
1 2 8 3
5 4 1 6
5 4 3
3 9
3 2 9 5
7 5 9 2
1 6
Hard #3
1 3 2 7 8 4
2 3 8
8 9 6
6 9
8 2
1 6 2 4
5 8 1 7
9 6
4 3 2
Hard #4
3
8 2 4 5
9 5 8
3 7 4 6
9 2 4
4 5 8 9 1
7 5 4
4 7 6
9 5 8
Hard #5
4 5 3 8
9
1 2 4
5 6 2
8 1 6
3 5 7 9
7 9 2 3
5 8
6 8 7 5 4
Hard #6
8 4 3 7
2
1 2 6
6 8 5
3 8 5 6 2
1 5 2 9
9 4 7 8
4 5
8 2 1
Hard #7
2 9 7
6 3
1 7 8 6 5
2 9 3
8 5 3 1
3 6 5
9 1 5 4
4 2 5 8
8
Hard #8
5 1 8
3 5 6 4
4 1 9 7
6 2
7 8 1
3 1 2
6 4
2 3 5
9 7 1 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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