Printable Hard Sudoku

Set hfj85l. 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 1 9
5 6 7 2 3
9 3 4
1 6 7
7 5 2 9
2 8 6
7 5
5 3 1 7
6 9
Hard #2
4 7
7 2 9 5 8
5 4 7 9
6 7 3 8
6
2 8 4
9 1 5
4 8 6
2 3 9 7
Hard #3
7 3 8 6
1 9 7 5 6
2 1
8 7 9
9 6
2 6
8 3 1 5 2
5 9 4 8
8 7
Hard #4
1 7
2 7 1 4 5
4 8 9 6
2 6
3 8
9 8 3
4 2 7 8
3 6 5 4 7
1 3
Hard #5
3 2 9 7
4 6 7
2 4 5
1 6 9
5 7 2
3 9 4
3 1 2 8
9 8 4
5 1 9
Hard #6
7 2 3
6 4 2
6 1 7 9
4 3 8 9 2
8 6 3
9 5 3 7
3 4 8 6
4
5 1
Hard #7
4 1
5 9 7 8
5 3
7 1 8 4
8 5 3 4
2 4
7 3 2
9 6 2 4 5
6 1 7
Hard #8
9 2 8
7 2 6 3
1 3
8 1 4 5
9 3 1
2 8 4 3
6 2 1 7
5 6 7 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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