Printable Hard Sudoku

Set f4tew2. 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
6 9 7
3 5 1 8
4 6
1 3 9 8
4 9
7 6 1
5 3 7 2
6 2 4 3
8 5 7
Hard #2
4 2
6 9 1 2 4 3
5 6 7 9
3 5 7 2
8 9 6
8 2 3
9 7
4 5 6 9 1
Hard #3
4 7
3 7 6
2 8 1 9
4 6
1 4 7
9 8 3 2
1 8 5
9 5 2 6
2 8 5 6
Hard #4
6 9 5 4
3 8
2 5 6 3
7 5 1 8
1 6
6 5 7
4 1 2
2 3 6 8 5
4 7
Hard #5
3 6
8 7 3 2
9 1
3 2 7
2 3
1 5
7 3 8 1
2 7 9
9 3 7 1 2 5 8
Hard #6
7 9 3 6
6 5 3
1 6 8 9
9 1 6
6 2 7 8
3 4 6 2
8 5
3 7 9 2
9
Hard #7
8 4 7 5 6
7 2
6 4 7
5 6 3 9
4 9 7 1
5 8
1 9 3 5
9 5 6
7 4
Hard #8
6 1 4
9 3 1 2
3 5 9 6
5 9 2
2 8 5
9 1 3 7 4 2
8 7 4 9
7
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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