Printable Hard Sudoku

Set 1f9wzej. 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
8 5
2 6 7
7 3 4 5 1
3 2 5
9
6 7 9 4 5
1 6
4 5 8 7
1 7 5 9
Hard #2
9 8 7 4 3
5 7
8 6 1
9 5 2
9 3
2 6 4 9
6
5 1 3 9
6 3 4 1 8
Hard #3
7 8 5 4
9
8 4 2 3
4 5
1 9 7 6
9 6 2 3
5 8 7 3
3 2 1 6
4 2
Hard #4
7 5 8 1
4 7
9 3 2
3 4 2
7 4 6 2
9 2 8
8 7 9 5
2 1 3
4 6 7
Hard #5
2
5 8 1
9 8 7
3 1 8 4
5 4 6 7 2
2 8 9
3 4 9
9 8 2
2 3 5 6
Hard #6
4 1 2 5
9 5 8 6
6 4 1
2 9
6 5
8 3 9 1
3
9 4 7 8
3 7 9 5 6
Hard #7
6 4 7 1 2 9 8
1 7
8 4
9 2 6 3
2 3 7 6
5
9 1 3 6
9
5 6 9 4
Hard #8
1 3
6 9
1 3 6 9 4 8
4 2
9 7 6
1 3 9
6 2 7 3
9 3 5 6 1 4
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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