Printable Hard Sudoku

Set 1gvc2z4. 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
5 2 8
7 6 2
6 1 9
1 4 9 8 2
8 6 1
8 3
8 2 7 1
3 9
7 1 5 3
Hard #2
1 4 6
7 2 8 3 4
3 6 1
9 7
1 9 5 4
8 5 2 1 7
8 4 9
7 5
3 1
Hard #3
1 9 8
6 2 7
8 1 4 9
3 8
3 9 8 1
4 2 9 6 3
4
5 6 8
1 2 4 7
Hard #4
7 8 1 9
1 2 6 8
8 3 5 7
4 7 6
2 8 6 1 9
2 5
4 6 1
5 1
8 3
Hard #5
9 5 4
2 4 1 3
8 5 7
2 3 5 8 9
8 5 7 6
5 1 3
4 9 7
2 8 5
1
Hard #6
5 9 2 8 4
1 7 9 5 8
4
3 1 8 9 5
3 8
7 1
4 6 1
8 2 6 7
6 9
Hard #7
4 9 3
4 8 7
6 7 9 5
2 5 7 3
3
1 7 6 4
9 5
5 3 7 4 1
4 1 2
Hard #8
6 7 3
4 1
4 5
6 1 4 2
5 9 3 4
9 7 6
2 6
3 5 8 1 2
1 8 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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