Printable Hard Sudoku

Set e5ik1b. 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 8 7
3 7 1 4
3
4 8 3
9 6 4
3 2 5 7
5 3 8
1 6 9 8
3 1 7 2
Hard #2
8 1 3 9
1 8
6 3
4 8 3 2 1
7 5
2 8
3 5 1 6
6 7 2 1 5
5 4 2
Hard #3
4 8 7
7 3 2
9 4 5
4 2 5 9
8 1 7
2 8 1
2 5 8 7 3 4
8 4
6 4
Hard #4
1 9 8 5
2 1 4
1 4 6 9 5 7
7 2 9
5 1 4
9 8 3
6 7 4 1
2 7 4
Hard #5
6 4 7
9 5
2 7 3
5 7 8 9 3
8 9 1 2
6 4
4 2
3 5 8 6
9 8 4 1
Hard #6
7 6
6 1
9 2 6
8 3 4
3 9 2
6 9 1 4 3 5
4 1 9
8 7 2
2 3 6 8
Hard #7
2 7 9 6 4
9 2
3 7 5 9
6 4
7 2 5
1 3 4 9
7 3 9
3
5 4 8 3 1
Hard #8
8 3 6 1
6 2 8 7
4 9
8 2 5 4
4 3
7 9 6
2 8 7 3 1
4 7 2
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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