Printable Hard Sudoku

Set 1b50dlo. 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
3 2 6 5
5 2 4
4 8 7 2
1 3 9
6 5
2 3 6 1
5 8
9 2 1 5
7 9 2
Hard #2
6 1
9 2 6 3 7
2 8 9
8 9
2 7 4
5 4 9 2
3 6 5
9 5 4 8
8 7 5
Hard #3
5
7 9 6 4
4 2
8 1 3 9
4 3 2
9 8 1 6
6 7 9 8
9 3 2 4
2 7 3
Hard #4
4 1 2 7
3 5 1 7 9
2 3
2 7
3 6 1 2 4 9
8 6
3 8 1
4 7
8 9 4
Hard #5
2 8 4 7
6 3 9 7
7 9 1 4
5 6
8 3 6 2
6 3
3 4 2 8 7
7 5 3 4
Hard #6
7 1 5 8
8 4 1
2 6 7
3 9 8
7 9 4 6
5 2 3 9
2
5 6 7 9 1
7 3
Hard #7
9 8 4 1 6 3
5 4 9
6 9 2 7
1 2 8
4 2
5 8 7
9 1 4 2
2 7 9 6
Hard #8
7 1
8 3 7 2
2 9 3 1
2 8 6 5
1 8 2
4
4 6
6 4 7 1 8
1 6 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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