Printable Hard Sudoku

Set 1asct3b. 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
4 5 1
9 5
4 8 2 9
7 8 9
5 8 3 4
6 9 2 7
8 9 2 6
4
7 4 6 1
Hard #2
4 2 9
9 6 4
5 7 8
2 3 4
4 6 7
2 4 1 6
2 7 6
7 4 8
1 2 7 5
Hard #3
3 9 7
2 3
9 7 2 6
7
3 1 2 6 8 9
5 8 1
8 2 3 6 1
9 8 3 5
1
Hard #4
1 8
7 9 6
5 4 2
6 7
4 5 7
7 2 1 5
3 7 5 1
7 5 2 3
9 3 4 7
Hard #5
7
1 7 4 8
4 3 8 2 6
8 6 5 9
7 1 4 3
1 3 9
4 8 5 7
6 2
8 6
Hard #6
3 4
2 3 7 9
7 1
9 8 1 5
4 7 3 6
5 1 3
8 6 5 1
4 6 8
1 9 6
Hard #7
7 3
3 1 6 9 4
9 8
1 7 9 6
3 9
2 3 4 7
5 3 8 7
7 4 1
1 6 5
Hard #8
3
6 4 2
7 9 2 1 6
2 1 8 5 3
9 8 7 2
4
5 2 8 7
7 3 1
9 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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