Printable Hard Sudoku

Set 1rab19w. 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 1
1 9 4
7 4 1
5 8 4 3
1 6
2 8 7 1
3 2 7 1 9 5
5 2
1 3 6
Hard #2
3 2 6 1 4 9
9 8 7 5
5 3 6
6
7 8 1 4
4 9 8
9 7
8 6 7
3 5 1
Hard #3
9 3
8 4 3 5 7
1 8 9 4 5
8 9
2 4 6
3 1
2 9 3 1
4 9
4 1 6 5
Hard #4
5
8 5 9 3
7 2 8
3 6 8
4 7 9
2 5 4
4 6 9 7
8 3 7 2
5 6 4 1
Hard #5
5 1
6 7 8
1 3 5
8 3 5 2 4
9 4 3 5
4 7
2 6 5
6 8 9
1 4 8 9
Hard #6
8 3
7 4 2
5 1 9 6
3 2 4
4 8 7
1 4 6 3 9
1 2 7
4 3 6 5 2
7
Hard #7
7 9
9 2
6 5 7 2
4 9 8 7 2 5
6 5 3
1 3
4 1 6
1 8 9
3 1 4 8
Hard #8
8 7 1
5
3 1 4 8
7 6 8
2 1 5 6
3 7 2
2 8 5 1 3
9 1
1 3 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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