Printable Hard Sudoku

Set 5779d4. 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
3 1 2 7 6
9 7 4 5
5 4
2 5 8
6 1
5 2 9 6
6 4 8 3
1
8 9 4 1
Hard #2
5
7 9 2 6
8 2 3 4
1 9 8
2 1 9 4
3 4 7
5 1 9 4
4 8 7 5 3
5
Hard #3
4 7 2 9
5
7 2 9 3 4
4 7 3
6
7 3 2
2 7 3 8 5
5 7 6
9 6 4 2
Hard #4
5 9 8 1
8 1 3
3 8 6 4
9 5 3
2 4 7
1
8 2 6
6 3 2 4 7
1 9 5
Hard #5
3 7 2 9
5 9 2 1
5 6 4
6 4 1
2 5
4 6 3
4 1
9 8 7
7 6 3 1 5
Hard #6
6 5 4 9 7
8 1
8 4
3 4 8 6
7 2 5 4
8 6 5 9
8 4
1 2
4 6 7 5
Hard #7
1 3
3 8 6 4
4 9
6 4 1 5
9 6
1 7 9 8
8 7 2
7 2 1 6 9
1 8 9
Hard #8
2 9 8
5
4 1 2 7 9
8 4
1 2 5 7 6 8
1 5
3 5 4
7 3
3 5 4 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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