Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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