Printable Hard Sudoku

Set 1t5k9zd. 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 8 2
1
2 5 9 1 7
9 3 6
7 2
8 9 3 5
9 1 7 3
3 2 6
5 6 3 8
Hard #2
4 5
3 2 9 7
9 2 8 1
2 1
4 8 3 9
7 3 6 5
9 8 3 6
1
5 6 1 9
Hard #3
3 4 2
7 4 6 8
8 5 2 6
6 5 2 9
5 8
1
8 4 9
1 6 4 3
4 2 7 6
Hard #4
9 6 4 2
9 1 2 3
8 5 9
6 4 8
9 3 7
7 5 1 3
9 1 6
8 5
9 2 5
Hard #5
1 5 4 8
9 2 6
2 7
4 2 8
6 4 2 3
7 8 9 5 1
7 9 4
3 7
6 3 1
Hard #6
3 6 2 1 8
4 8 7
1 5 9
1 9 6
4 9 1
1 8 3
8 9 5 1
2 5
6 8 4
Hard #7
6 9 3
2 4 7
9 6 1 2
7 8 1 4 9
1 3 9
8 5 6
3 9
1 4 9
5 7 4
Hard #8
1 2
5 2 6 4 1
9 3 2 5
3 9 1 4 8
2 1 7
7 9
4 7 9
8 4 5
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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