Printable Hard Sudoku

Set 183hesg. 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
7 1 2 9
2 4 9 3
4 2 8 6
9 2 1
9 7 2
3 7 1 6
9 4 5
4 6
3 7
Hard #2
2 5 4 6
7 8 2
8 2 3 1
3 1
8 6 5
7 5 6 4
8 2
4 8 9 3 5
3 6
Hard #3
8 9 1 5 3
6 8 4
7 5 6
3 1
4 9 8
3 7
9 5 6 4
7 1 5 9
9 1 2
Hard #4
8 9 1
3 2 8
5
2 7 3 6 8
5 8 1 6 2
8 4
1 7 8 4
6 5 8
4 9 3
Hard #5
4 6 9 7
1 3 2 8
5 6 1
7 4 9
5 3
6 8 1 3
4 2 8
8 5 3 1 7 2
Hard #6
1 8 7 2
1 3 8 6
7 9 5 1
4
1 2 3 4
3 5
6 9 7 2
4 9 8
8 2 4
Hard #7
2
3 5 1
6 4 5 3
8 4 1 2
3 2 1 5
6 2 7
5 8 7
1 4 7
3 2 8 6
Hard #8
3 9 4 1
5 6 8 7
6
8 1 2
1 2 5 4
4 2 9
7 5 3 2
2 4 9 7
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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