Printable Hard Sudoku

Set r6avbc. 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
1 2 7 5
5 4
6 3 7
9 1 3 5 2
1 2
7 9
1 2 7 3 4
3 4 6 2 5
9
Hard #2
3
8 4 9 1 6
1 7 5
8 5 6 9
3 2 8 4
4 9 1 7
3
3 2
5 7 9 6 8
Hard #3
6 1 8
4 3 6 1
7 6 9 4
4 8
9 8 1
3 5 7 2
8 5 1
4 2 9
2 5 3
Hard #4
7 1 5
2 5 6 7 1
1 7 9 2
7 2
3 4 2 9
9 8 3 4
6 7
8 4 3 5
5
Hard #5
1 4 2 6 8
5 8 9
3 7 9 6
6 8 5
3
9 7 2 4
8 6 3 1
2
3 9 8 2
Hard #6
6 9 3
2 4
2 8 6 7
7 4 2 1
8
3 5 8
5 9 2 8 4
6 4 5 2
3 5 1
Hard #7
7 4 9
2 8 3 5
3 6 1
7 9 2
2 8 5 6 9
1 4
9
8 1 6
6 1 3 5 4
Hard #8
7 8
3 6
1 3 7 9
3 4 2 9
6 4 1
7 9 6 4
2 8 4 9 7 1
5 2 6
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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