Printable Hard Sudoku

Set 1x06tl4. 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 1 7 9
3 9 5
7 5 9 3 2
9 2
4 3 1
5
3 4 7 6
4 8 2
6 7 9 4
Hard #2
5 1 7 3
9
2 7
4 3 7
1 7 3 5
6 2 8
3 5 6 1
8 2 5 9
9 5 8 3
Hard #3
5
6 3 2 8 4
9 7 6 3
2 6 8 7
3 7 9 5
9 1 2
7 2 4
4 5 8
9 3
Hard #4
7
9 5 4 3 8
6 2 9
9 1 2 5
8 2 3 6 1
6 1 8
3 9 6 2
8
7 3 9
Hard #5
2 3 9
9 7
5 1 6
6 9 1
9 1 2
7 1 9
9 3 8 5
7 6 2 3
1 4 9 8
Hard #6
5 9 1
3
6 2 1 5 3 8
1 5 6
4 9 3 5
8 6 4 9
2 6 9
1 8 2
3 1
Hard #7
6 8
2 9 1
9 3 2 8
1 8 7 4 5
6 7 2
2 6 1
7 5 3 9
3 2 9 5
6
Hard #8
2 7 1 3
3 9 2 6 4
6 3
1 3 5
7 2
5 1
4 8
9 5 1 3
1 2 9 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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