Printable Hard Sudoku

Set 1i0p3qr. 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 8 2
1 2 6
3 9 7 5
4 7
6 1 2 3
2 9 6
8 9 6 2 1
8 3
4 1 7
Hard #2
7 2
6 9 3 1
2 5 1 6 4
3 2
5 3 8
2 9 1 3
1 9 3 6 5
6
5 2 9
Hard #3
6 4 1 3 5 8
8 5
2 5
3 9 7 2
9 3 8 4 6
1 7
5 6
1 6 8 5 2 9
Hard #4
1 7
2 5 8 9
9 7 6
4 8 7
5 3 2 6
6 4
6 4 7 2
1 8 6 3
1 2 8
Hard #5
2 3 1 8
7 9
5 2 4
9 7
4 5 1
2 6
7 5
3 2 6 1 4
5 4 2 6 3 1
Hard #6
2
8 5 6
6 5 7 1
5 4 3 7
7 6 4
6 1 3 2
8 4 7
7 2 8 4
5 6 8
Hard #7
4 6 7
3 8
9 5 6 2
9 7 1 5
4 9 2
5 9 3
5 2 8 1
8 3 9
2 1 9
Hard #8
8 2
5 2 1 4
7 6 3 9
3 9 1
1 7 4
4 1 2
6 5 1
3 7 4 5
8 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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