Printable Hard Sudoku

Set 1h19cbn. 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 9
3 2 5
3 4 9
3 7 6 4 2
2 1 5 3
7 1
4 1 6 7 9
5 8 3
6 8
Hard #2
7 3 6 2
1 5 6
2 8 5 7
2 9 5
6 8 7 4
4 3 7
9 1 3
6 5 8 2
2
Hard #3
2 1 9 5
7 5 1 6
1 7 6 3 2
9 5
5 3 7
8 1
5 7
4 6 7 8
2 1 9
Hard #4
3 5 2
5 3 6 7
1 7 2
9 1
6 9 5 4 2
4 8 6 9
2 9
9 4 7 8
8 4
Hard #5
2 3 4 8
6 1 9
3 2 7 6 1
6 1 9 5 2 3
3 7
3 7
4 2 7
2 9 1 6
Hard #6
8 1
2 9 7
1 5 9 7
6 3
7 1 4
9 3 8 1 2 7
4 3 8
3 5 6 9
2 5
Hard #7
1
6 1 9 8
4 6 3
3 8 6 4
1 9
1 5 9 2
5 9 8
8 3 9
4 7 3 8 2
Hard #8
6 9
8 3 6
7 9 2
6 5 4
4 1 6 3
5 2 8 1
9 1 8 4
4 1
7 2 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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