Printable Hard Sudoku

Set 1cfzf5e. 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
4 1 9 7
2 9
7 4 2 8
6 3 4
6
9 2 7 8 6
3 5
2 1
3 1 2 8 6 4
Hard #2
1 9
3 7 6
2 9 3
1 5 3 9
2 5 4 6
4 9 7
7 8 6 4
9 6 2
1 3 8
Hard #3
4 7 5 2 1
1 8 5 3 9
1 6 8 4
6 3 9
5 9 1
9 2 3 8
5 2
6 1 4
Hard #4
6 3 7
2 6 4 1 3
1 4
8 1 2 4 9
9 2 6 1
7 6
9 1 3
2 7 9 8 3
Hard #5
9 2
8 7 9 4
4 5 1
3 4
9 6 8 7 5
5 2
7 2 8 1
3 2 7
2 9 1 3
Hard #6
6
9 8 2
1 2 6 7
2 9 7
6 7 4 9
3 2 8
4 3 9 7 1 8
2 3 7 5
9
Hard #7
6 8 1
1 4 6
4 2 5
5 6 9
1 2 5 3
9 7 4 3 8
3 8
4 7 2
8 2 7
Hard #8
9 2
4 7 5
2 7 1 8 9
1 8 9 4
4 3 9
3 7 5 1 6
5 6
9 1 2 7
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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