Printable Hard Sudoku

Set 1owxul4. 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
6 3 1 5 7
6
4 5 8 9 6
9 4
5 6 7
8 4 1
5 1
3 4 2 5
6 1 8 4
Hard #2
2 7
2 5 6
5 8 6 9
4 1 7 3
6
9 1 2 8 5 4
6 1 5
7 1 8 3
3 5
Hard #3
1 7
5 9 1
8 4 5
9 8 3
5 8
3 4 5 2
8 4 3 6
5 2
9 2 8 6 4 3
Hard #4
6 4 7 2
3 7
5 2 3
2
9 3 1 5 6 8
8 5 1
4 2 9 5
9 1 7
2 8 4
Hard #5
6 8 9
7 9 2 8
2 4 5
4
3 1 2 5
6 9 7
1 5 7
4 3 7 2
5 2 8 3
Hard #6
6 9 4 3 5
2 9 1
4 1 5 6
9 5 1
7 3 6
5 7 1
4
5 2 4 9 8
7 8
Hard #7
5 7
1 4
7 2 9 6
6 5
3 1 9 8
7 1 4 6
4 2 9 8
7
4 8 6 1 3 2
Hard #8
2 1 3
7 3 9
7 9 8 6 4
5 1 8 2
1 4 5
6 5
7 3 1 2
9 1 3 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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