Printable Hard Sudoku

Set 186eyez. 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 1 9 3
4
4 1 6 5
3 9 7 8
5 4
5 4 3
9 2 3 4 8
2 9
6 7 1 3
Hard #2
5 9 8 6
3 1 9 2
5 1
1 9 3
7 5 8 2
1 2 4
3 7 4 1
6 3
4 9 6
Hard #3
8 6
1 9 5 3
5 7 9 6 3 1
2 7
2 1 8 4
8 3 5 6
1
3 9 6 8
8 7
Hard #4
3
3 4 1 2
7 8 3
6 9 4
8 1 6 2 5
9 1 4 7
8 6 9
5 4 1
3 9 7
Hard #5
7 2 1 6 5
8 2 7 3
1 5 8
4 3 5
8 6 4 1
7 3
9 7 6 3
5 9
8 4
Hard #6
7 2
2 1
9 4 6 5
7 9
8 4 3 6 1
5 8
7 8 3 5 6
6 5 4
4 1 7 8
Hard #7
3 7 2 9 5
1 9
3 4 2
6 8 1
5 2 3 9 8
2
6 5 7 8
9 3 8
4 2 6
Hard #8
5 7 4 1 8
4 6 5 2
3 1 5
7 4 1
3 5
6 3 2 7
1 2
5 8 4
3 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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