Printable Hard Sudoku

Set zts4at. 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
7 2 4 9
7 4 2
5 2 6
4 8 5
3 9 4 2
1 7
7 8 6
9 6 3 4 5
1 5
Hard #2
5 8 2
9 2 6 1
6 4 5 3
1
4 8 5 3
3 8 7 9 5
6 1 4 5
3 5 8
7
Hard #3
1 6 4
3 2 5 7
5 1 6
3 7 6 1 5
1 8
7 6 9
7
6 7 4 8 2
1 2 3
Hard #4
9 7 8 1 5
9 6
5 7
1 4 3
8 3 1 7 9
5 1
5 2 8 9
4 1
8 7 3 4
Hard #5
1 9 4 7
4 8 7 5
7 3 5 2 6
9 4
6 3 7
5 4 7 1
8
9 6 4
5 3 6
Hard #6
7 4 2 8
2 9
4 8 1 5
6 7 3
2 3 4
9 7 2
5 4
5 3 7
8 3 2 6 9
Hard #7
6
1 7 5 8
3 4 8
2 9 5
6 4 3 2
3 7 9 8 1
9 6 7 2
5 2 9
8 9
Hard #8
6 2
1 9
7 8 3
3 2 6 8 7
8 6 1
3 8 1 2 5
4 7 1 5
1 4
5 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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