Printable Hard Sudoku

Set 1fko4o7. 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 8 1
2 9 7
7 1
4 3 5
6 1 9
3 2 8
7 8 3
2 6 7 5 9 4
3 4 6
Hard #2
7 3 1 9
3 7 4
8 5
3 6
7 1
8 6 5 4 3 1
3 6
9 8 2 7
5 1 7 9
Hard #3
9 8 3 1 7
1
3 7 5 6
2 3
5 4 2
8 1 9
4 1 9
2 6 7 5
9 3 2 5
Hard #4
4 9 1 3
5
6 3
1 8 6
6 2 1 3 7
6 2 4
8 5 9 2
9 7 6
2 3 7 8
Hard #5
6 9 3 8 1
9 5 4
5 4
2 9 1 4
3 5 9
6 2
7 2 9
8 5 1 3 9 6 7
Hard #6
3 1 4
9 7 5
4 6 3 7
8
8 2 7 1
6 5 4 9 3
8 2
4 6 8
2 3 9 7
Hard #7
1 3 7
8 6 2 1
5 8 4
9 5 8
3 4 6 5
2 9
3 8 2
6 7 1
8 1 6 3
Hard #8
7 3
6 9 7 5
8 5 2 7
8 1 9 7
2 3
2 4 8
6 5
8 9 3 7 4
1 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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