Printable Hard Sudoku

Set 4i21f7. 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
1 9 8 4
1 9 3
8 7 3
7 5
4 2 1
9 5 3 7 2 8
5 7
1 9 5
7 9 2
Hard #2
4 9 2 1
7 8 3
2
5 8 1 2 6
9 4
6 4 1 2
2 1 3
4 5
7 6 9 5 2
Hard #3
1 9 8 3
6 1
6 2 5 9 4
2 3 8 6
5 4 8
8 7 1 4
5
8 1 9
7 2 4
Hard #4
5 8 6 7
4 1 3 5
1 8 9 3
1 5 8
7 9
5 6 3 4
2 7
4 3 9 6
6 1
Hard #5
8 9
6 3 1 5 7
9 7 2
1
9 7 6 3 1
8 6 2 7
1 2 3 5
5 4 8
8 2
Hard #6
5 3 2 9
9 3 7
4 3 6
5 7
1 9 8
5 6 4
1 6 4 9
8 5 3 2
9 7 2
Hard #7
7 2 1 5
2 5
7 1
8 7 1 9
7 3 8 6
1 6 4 3
6 9
6 8 3
4 5 8 7
Hard #8
3 7 2 5
7 6
2
7 8 5 4 1 2
7 9
4 3 2
9 1 5 4
2 1 8 3 5
8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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