Printable Hard Sudoku

Set 185mbt6. 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
3 9 6 4
2 3 8
8 5 2 6
1 8 5
4 1
3 7 4 9 2
5 9 6
1 3 5 7
7
Hard #2
9 5
2 4 9 1 3
5 6 4
6 7 1 2
2 7 3 8
5
1 2 3 4
9 8
7 6 5 1
Hard #3
2 8 4
8 3 1
4 2 3
8 5 1 6 9
3 9 2 5 1
5 8 2
9
6 1 3
1 4 3
Hard #4
9 8
2
5 6 1 3
3 1
6 1 7 3 4
4 2 5 8
8 5
4 9 3 6
8 6 3 4 9
Hard #5
2 1 3 7
6 5
7 4
2 9 3 8
1 2 9 5
6 5 1
5 4 3
4 1 8 2 6
2 8
Hard #6
7 3 1 4
2
1 7 6 2
4 9 1
8 7 6 5 9
9 3
6 3 1
5 2 7 4
7 8 3
Hard #7
7 3 1 6
7 2 4
4 8
9 7 5
2 6 1 3
7 9
7 8 3 4 6
6 2 7
2 8 9
Hard #8
5 8 6
6 7 5 8
4 9 7 2
7 6
7 6 1
4 3 2 5
4 2 3 7
8
8 1 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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