Printable Hard Sudoku

Set 1b692yd. 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
8 3
1 8
7 6 4
5 1 4 2
2 3 9 8 1
9 7
9 3 7
7 1 5 6 9
3 9 8
Hard #2
6 4
1 4 5 3
8 7 3 9
2 3 5
5 1 7 6 2
4 7
8 9 7
4 1
3 1 9 8
Hard #3
4 8
6 7 1
1 3 4 6
7 4 5
7 1 4
3 2 7 9
9 1 5 6 8 7
2 8 9 1
Hard #4
6 7 1 3
9 5 4
9 1 5 2
4 5 7 8
7 1
3 6 4
7 5 1 2 8
2 4
8 1
Hard #5
8 2 5 3
2 3 9
8 6 5
6 4 1
7
1 5 9 3 4
9 6 4 3
7 8 2
6 1 4
Hard #6
3 7 8 9
8 2
6 3 5
1 4 6 7 5
6 1
2 4 1
2
9 3 7 6
4 2 3 8 1
Hard #7
7 9 5 6
6 9 1 8
8 4 6 2
7 9 2
3 7 5
9 4 1
8 5 7
9 4 1
3 8
Hard #8
8 7 4 2
1 4 8 6
2 9 3 5
1 6 9 4 2
4 5 2 3
7 9
9 8
5 9 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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