Printable Hard Sudoku

Set 1lwpxg4. 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
7 9 1 8 3
8 1 9
2
1 5
4 3 6 2
9 1 3
3 5 4 2
4 7
4 2 3 9 8
Hard #2
1 5 6
3 8 2
2 9 3 7
8 7
2 4 9 5
3 4 2 5 7
9 4 6 7 8
3 8 4
Hard #3
1 4 6
3 4
9 8 5 7
3 7 2 9
6
6 3 7 8 2
1 9 6
9 5 3
2 5 6 1
Hard #4
5 7 4 8 3
7
5 4
1 5 2 7
4 6 2 5
2 1 9 6
1 5 3
9 4 7 6
3 9
Hard #5
3 4 5 6 7
4 5 7 1 2
5 9
8 4 3 9
3 1
2
6 9 2 4
5 9 8
7 4 1
Hard #6
8 2 6
1
1 4 3 9
4 6 1 3 8
9 7 6
2
6 5
3 4 8 2 9
7 3 1 8 4
Hard #7
5 7
7 9 4
4 9 6 5
9 2 5
5 8 3
3 2 4 8
2 4 5 1
7 6
6 9 7 1
Hard #8
4 1 6
8 1 9 4
2 9
2 3 7 9 4
4 5 1 3 7
3 5
2 1
9 1
8 4 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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