Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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