Printable Hard Sudoku

Set 1oxyp3j. 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
2 9
8 1 6
8 9 6 4 2 5
2 6 7
9 7 1
3 6 1
6 3 7 5 1
8
2 8 9
Hard #2
5 4 7 1
4 3
9 8 2
1 8 9
6 2
4 6 2 9 8
2 5 7
4 1 3 8
8 3 4
Hard #3
6 1
3 4 8 2
2
7 4 8 2
8 1 6 2 3
3 6
7 4 9 5 2
5 7 1 9
3 4
Hard #4
5 7 6 1
1 8 3
3 9
2 1 4
3 6
4 2 8 3
4 7 6
5 1 7 3
7 6 8 1
Hard #5
5 4
7 5 2 6
4 6 3
5 9 2
3 1 2 6
1 9 8
1 6 9 4 3
7
8 9 6 5
Hard #6
9 5 3 4
1 5 8 7
7 1 5 2
3 5 2
5 9 8 3
8 6
9 6 4 2 7
3
1 6
Hard #7
8 5
8 5 3 4
3 1 7
9 7 8 2
2 4 9
8 3 6
5 7 8 6
6 7 2
3 6 9
Hard #8
3 1 4
1 5 3 2
6 9 1 5
7
4 9 5 2 3
5 6 4
9 5 6 8
3 8
4 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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