Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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