Printable Hard Sudoku

Set 66tk2l. 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
9 2 4
8 5 3 1
1 5
9 2 7
6
5 1 9 3
3 4 1 7 9 8
6 1
1 8 9 5
Hard #2
2 8 9
4 9 5 3
4 6 2
6 8
6 2 4 1
8 6
6 2 3 8
7 8 9 5 4
1 7
Hard #3
2 7 5
3
7 5 4 8
1 6 3
6 2
3 5 9 8 2 1
9 3
9 8 7
4 6 8 2 5
Hard #4
4 5 2
2 6 9
5 4 3
4 3 1
6 1 9
5 3
2 8 5 9 3 1
2 1 7
1 6 7
Hard #5
4 7 2 3 6
1
6 8 5
3 9 1 2
8 9 4
1 6 4
3 7 8
3 2 7
8 7 5 3
Hard #6
1 6 4
7 5
6 1 4 3 9 8 5
5 9 6
2 5 3
7 1 4 3
1 7
7 4 8
3 6
Hard #7
8 6
9 3 2 4 1
1 5
4 5 1
2 4 7
7 1 3 2
3 1 4
5 8 2
9 7 8 6
Hard #8
6 7 1 5
4 8 2
7
4 5 9 2
9 8 2 3
3 5 1 4
2 5 9
8 6 4
3 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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