Printable Hard Sudoku

Set 1ljtzc4. 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
2 4 7 3
7 3 5
3 1 8
4 8 9
8 2 4
5 2 6 3
1 2 5 6 7
9 5
1 9
Hard #2
1 5
8 2 3
8 6
4 5 6 2
4 7
3 2 6
4 6 8
1 8 9 7
5 1 3 8 2 9
Hard #3
8 1 5 9 3
7 9 5
5 3 8 7
8 9 2
3 6 7
2 1 3 6
2 8
8 4 5
1 6
Hard #4
1 9 6 5
7 5 4 1 2
6 5 9
7
2 4
4 7 5 8
2 6 5 4
8 1
1 3 7 9
Hard #5
3 7 4 8
9 1 3
7 8 6 9
9 5 2 3 1
1 8
9
5 1 9 6 2
5 1
1 8 4
Hard #6
4 8
9 2
3 8 9 1
8 9 5 1
2 7 1 3
9 3 5
2 3 6
5 9 4
4 7 8 5
Hard #7
6 1 7 5
7 5 6 9
5 1 9 7 6
4 6 2
2 6
7 8 9 1
2 3 5
7
6 3 9
Hard #8
3 1
1 2 8
4 8 7 3
9 6 2 1 5
2 8 6 7
5
8 6
4 3 7 5 9
3 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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