Printable Hard Sudoku

Set 1cgldn4. 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
2 1 8
3 4 1 5
4 3 7
8 3
6 9 8 4
4 1 7
7 9 1 3
5 3 4 2
9 6
Hard #2
9 6
1 7 9 5 2 4
5 4 6 7
4
3 7 6 1
6 5 2
4 5 9 8
8 2 6
9 8
Hard #3
8 6 2
1 8
5 3
1 3 4
4 6 9 5
5 7
1 8 3 6 5
4 8 3 2 7
2 7 6
Hard #4
9 5 3
2 6
1 9 2 5 7
7 1 6 5 2
9 1 6
4 2 5
7 1 8
4
6 4 8 7
Hard #5
1 5 7 2 3
4 8 2
2 9 1
2 5
9 6 5
1 7 4 9
6 1 7
3
4 8 3 9 1
Hard #6
9 1 3 7
6 5
3 4 7 1 6
4 8 1
8 5 7
4 9 7 1 2 3
2 6
6 7
7 1
Hard #7
2 1
8 9 3 7
7 8 6 5
3 1
8 4 5 6
5 9 8
3 6 8
1 3 6 2
6 1 4
Hard #8
3 7 4
5 9 7
6 2
5 4 8 9
7 3 8
2 1
8 6 4
5 1 7
1 2 4 7 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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