Printable Hard Sudoku

Set 1oowy8j. 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 9 1 2
4 3
8 2 9 4
9 5 4 1
7 1 8
6
1 2 7 8 5 6 4
5 6
7 5
Hard #2
9 5 8
5 2 1 4
3 1 7
4 6
5 1 8 9 3
1 8
5 2 9
9 4 3 7
6 4 2
Hard #3
8 1 6 4
7 8
6 9 1 7
7 4 8 1
5 2 7
9 3 8
1 5 3
9 5 2
4 1 2
Hard #4
5 8
8 5 1 6
1 9
5 9
3 5 1 7
4 9 1 8 2 3
9
6 1 4 2 8
2 9 7
Hard #5
1 4 8 5 2
3 5 6
9 8
8 1 3 7 5
6 9 7 3
3 2
5 6 7
6 2
7 3 4
Hard #6
8
1 3 8
1 6 7
1 7 3
6 5
9 2 8 3 4 5
5 6
5 4 1 3 2
3 9 2 5
Hard #7
5
7 4
9 2 4 8 7 6
4 8 9 6 2
2 7 8
3 4 5
3 5
6 1 5 2
1 4 3
Hard #8
5 9 2
4 5 7
8 4 9
7 4 5 6 1
2 1 6 3 7
8
3 8 9 5
2
1 9 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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