Printable Hard Sudoku

Set 1byar1u. 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
8 6 3
3 6 2 5 9
9 5 4
6 2 8 3
1 4 5 2 8
6 3 1 2
7
1 7 4
Hard #2
1 3
5 8 7 1
6 4
3 6
7 4 5
9 6 7 8
9 1 8 2 5
4 2 7
2 5 9 3
Hard #3
8 3 4
7 6 2
1 6 4 3
7 5 1
2 3 9 5
6 4
5 9 1
1 8 7 9
3 7 8
Hard #4
1 3 5 2
8
7 1 2
7 4 3
3 7 6 8 1 5
5 3 1 2
8 7
4 8 1
5 9 3
Hard #5
7 9
3 2
5 3 9 1
6 8 2
1 5
9 6 4 1 3
4 6 1 5 8
2 1 4 9 7
7
Hard #6
6 7 9 2
9 6 7
8 2 3 4
7 1 5
3 1 5
9 6 3 7
9 8
2 1 8
1 4 7
Hard #7
2 1 6 9
6 7 1
9 5 6
5 7 1
1 2 4
7 3 4 6
5 4 1 2
6 8
3 6 9
Hard #8
3 5 6 8
2 8 1 7
6 2
8 3 6
4 6 8 9
2 4 5 8
1 3 5
9 6 8
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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