Printable Hard Sudoku

Set 1sbswa4. 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 7 8
2 3 7
6 4
8 1 5 6 3
3 1
9 4 2
9 8 4 6 1
4 7 9
5 8 3
Hard #2
6
1 5 4
4 2 5 3
3 6 7 1 5
3 9 2
1 3 6
2 5 8 9
8 1 2 3
7 8
Hard #3
2 7 8 5
9 8 4
5 1 6
3 2 4
4 5 9 6 1
8 3
7 5 3 8
4
3 1 5 6
Hard #4
8 1 5 9 4
4 9 1
4 6
5 2 8 9 7
4 8 3 2
7 8
5
6 2 5
6 4 8 2
Hard #5
8 5 1 4 3
7
6 8
3 4
9 4 2 5 7
5 7 9
5 3 6
9 2 6 4
1 2 3 5
Hard #6
2 5 1 9
8 9 4 6 3
2 1 4 5
8 1 3
5 6 7 2
3 9 1
2 8 3 9
6 5
Hard #7
9 4
1 3 2 5
7 2 6
4 5 1 8
5 9
6 3 4 9 2
3 7 8
3 4
2 4 6 1
Hard #8
9 8
8 4 6 7
4 6 9 2
7 5 2
8
6 1 9 7
3 8 2 6 7
8 4 6
4 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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