Printable Hard Sudoku

Set 14nne23. 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
8
4 3 7 5
8 3 9 1
7 6 5 8
2 8 6 3
7 3 9 8
5 4 6 7
1 4 3 2
Hard #2
4 6 3
6 5 1
8 2
2 4
6 8 3 9
1 2 5 8
3 9 8
8 3 9 6 5
2 9 3
Hard #3
2 9 8 7
5 8 2
7 9
3 9 1 7 6
5 4
6 4 7 5
7 1 9
2 3
1 2 9 3
Hard #4
6 4 3
8 3 1 5
3 7 5 9
1 2 9
6 1
5 1 4
4 9 5 7 3
7 6 3
6 2
Hard #5
2 9
3 6
7 8 4 1
5 2 1 7 4 8
4 5
2 7 6
8 5 3
1 6 5
4 9 5 2
Hard #6
9 6 3 7
4 5 9 6
8 7
7 6 5
7 4 2
3 1 8
9 6
8 1 7 4 6
3 8 2
Hard #7
2 5 4
8 3
2 1 6
2 1 3 9 4
5 8 4 2
1 2 9
4 6 5 1
9
3 6 8 9
Hard #8
5 2 1 8
7 9 2
6 9 5
2 8
1 6 2 9
4 9 7
7 2 4 3
9 6 4
4 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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