Printable Hard Sudoku

Set 1eap3br. 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
8 1 5
2 7 8 6 1
7 9
9 5
8 3
9 4 8 1 6 2
8 5 4
6 9 3 2 8
Hard #2
1 5
4 5 7 3
5 1 6 3
8 9 5 6
4 8
9 1
7 4 1
5 1 2 9 4
9 3 2
Hard #3
1 5 6
6
7 4 3 1
3 4 9 2
7 8 3
7 1 8
7 2 3 8 9
6 9 2
3 4 7
Hard #4
8 5 1 9 4
4 9 7
3 2
1 2 8 7
5 7
1 3 9
6 9 5 1 8 3
2 4 9 6
Hard #5
2 6 3 9
6 5 1
1 6
6 4
8 3 4
2 4 7
3 7 9 8 6
5 4 2 8
1 3 9
Hard #6
7 6 5 4 2
9 2 6 8
3 5 7
9 5 4
1 2 3
1 6
5 3 1
9 1 3 2
7 9
Hard #7
9 4 2 7 3
5 2
1 9
2 5 3 6
1 7 6 4
3 8
7 1
5 4 3 7
2 4 7 1
Hard #8
7 1 3
2 8 3
3 7 6
9 5
2 7 5 9 4
6 9
2 8
9 7 3
5 3 1 9 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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