Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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