Printable Hard Sudoku

Set 180ite3. 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 6
7 1
9 3 1 6 8
9 6 5
7 5 4 9
6 9 7 4
9 3 8
3 4
1 4 8 2
Hard #2
9 3 6
2 8 1 3 6 9 4
7 5
6 1 4 8
7 8 3 1
6 8 4
8 3 4 9
5 3
Hard #3
2 9
8 3 6 5
2 1 4
1
6 9 8 1 2
7
3 4 7 1 6
6 8 7
8 9 7 3 6
Hard #4
7 4 6
8 9 1 3
4
7
8 1 9
1 2 9 8
4 1 7 2
1 7 5
5 9 8 2 1 4
Hard #5
9 3 1 7
2 4
6 1
4 6 8 9
8 9 3 5 4
5 8 4
7 1
6 7 4 2
3 2 5
Hard #6
4 5
3 4 7 8
2 1
9 6 8 2
7
4 5 3 1
3 9 6 5
7 3 9
8 6 4 2 7
Hard #7
2 8 1
5 3 7 1
4 1 7 5 9 2
7
3 1 4 8 6
9 6 3
3 4 9 5
6 8 4
Hard #8
1 6 9
1
9 3 2 8
4 9 1 2 5 7
8 5 4 9
7
6 7 1
7 3 8 1 6
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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