Printable Hard Sudoku

Set 1i5zrdj. 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
9 4 3
3 7 8 4 6
6 1 2
5 7 6 2
4
7 2 8 1
2 1 3
2 9
7 6 3 4
Hard #2
2
3 1 9 5
7 5 1 8 3
2 6 5 7 8
3 8 4 5
5 8 6
7 4 8
3
3 9 7
Hard #3
9 2 1 8
6 5
7 4 5 6 3
5 9
3 6 9
7 1 3
3 7
3 8 1 5
1 6 7 4
Hard #4
2 7
7 1 6
3 7 5 4
5 8 9 6
1 2 5 8
5 3 2
2 1 7
4 1 9
9 3 7
Hard #5
5 8
5 8 1 7
3 1 9 2
1 4 6 9
9 5 8
9 6 3 2
4 2 7
8 4 2
8 5
Hard #6
6 2 3 5 1 8
8 1 7
3 6
7 9
6 1
2 4 7 5 8
3 1 9 2
1 6
7 4 1
Hard #7
7 2 1
2 7 9
1 3 9
9 1 6
7
8 4 5 2 3
1 8 2 3 7
2 5 6
3 9 1
Hard #8
9 3
6 1 2
1 8 2 3 6 7
2 1 3 5
4 7 6
9 8 7
8 6
9 7 3 1
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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