Printable Hard Sudoku

Set 1i7tuzu. 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 4 7 3 8
5
8 4 7
6 8 5 7
4 5
9 3 7 2
4 1 2
6 3 7 5
8 7 4
Hard #2
3 1
5 4 6 1 9
8 6
2 5
6 9 3 1 4
2
9 4 2 8 5
3 8 7 2
7 5 9
Hard #3
3 7 5
4 3
5 9
3 8 4
2 9 6 8 7
6 5
1 7 6 3
4 1 2 9
9 3 7 8
Hard #4
1 7
6 4 9
9 3 7 6
5 4
3 1 4 8
8 4 6
6 3 9 5
5 7 4 8
8 7 1
Hard #5
3 6 2
7 6 3 5 2 8
8 7 1
5 9 7
3 5
8 3 1 9
6
9 8 2
7 1 4 5
Hard #6
4 2 1 3
7 9 2 4
1
9 3 5
8 6 2
2 1 9
8 4 5 3 6 7
1
6 5 7 4
Hard #7
4 1
3 6 9 8
6 2 4
6 1 5 3
5
4 8 7
7 4 8 3
8 2 5 6 9 4
3 9
Hard #8
8 9 4 3
9 2
4 7 1
9 2 4
3 1 2 9
3 8
3 4 1 5 2
9 8 6
5 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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