Printable Hard Sudoku

Set 1j2arp3. 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
5 7
2 7
6 1 5 2
4 2 3 8
7 6 8 2
4 5 6
6 1 5
2 3 1 9
9 8 3
Hard #2
2 3 8 4 1
9 1 7 2 5
5 1
2 6 5
9 4
5 8 4 7 6
3 9
3 6 2
1 7
Hard #3
8 5 2
5 6 9 3 1
1 6 9 4
8 3 7
8 4
7 2 6 3
1 4 5
7 8 1
2 9
Hard #4
5 7
7 4 9 6
1 8 2
3 4 7
9 5 4
5 2 7 8
3 6
9 5 2
2 7 1 3 4
Hard #5
6 4 9 5 7
3 8
8 3 2 1
9 8 3 4
5 6 4
7 2 9
4
1 7 8
4 3 6 2
Hard #6
6 7
5 3
9 8 1 2 7
4 1
5 6 7
4 7 3 5
8 9 7
1 4 8 2
4 2 3 6
Hard #7
1 6 8
7 6
3 9 4
4 3 8 6
1 2 6
8 7 3
7 5 9 2
5 8 4 3
2 9 5
Hard #8
5 8 4 6
9
4 8 6 1 5
6 9 7
4 5 8 3 2
1 2 9
7 2 5 6
6 4 7
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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