Printable Hard Sudoku

Set ybmk0t. 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
9 1 4
9 6
4 2 3 6
7 4 3 1
2 6
1 3 7 2
9 7 1
3 7 9 4
5 8 9
Hard #2
3 2 5 4 6
1 3
7 4 3 5
4 2 7
8
9 4 6 5 2
7 8 5 3 9
4 7
1 2
Hard #3
5 3 7
9 7 3 5 8
1 4 3
4 6 2
3 4 8 5
9 5
7 9 1
1 3 4
7 3 2
Hard #4
6 5 9 2 7 4
3 5
3 6
3 6
9 7 2 8
1 9 5
8 6 7
4 8 1 6
1 9 5
Hard #5
1 5 9 4
3 5 2
9 4 3
3 6 9
4 5 7 1
2 9 1 8
2 6 4
1 2 3 7
3
Hard #6
2 1 9
8
1 8 6 5
7 8 2 9
6 4 5 7 3
5 8 4
8 1 2 7
3
7 2 3 4
Hard #7
4 7
4 6 2
8 3 7 9
4 9 6
2 3 4 5
1 4 9 8
8 7 3
9
2 7 8 5 6
Hard #8
7 5
2 8 1
2 6
1 2 5 8
9 8 4 7
8 3 5 4
7 8 1 3
4 5
7 8 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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