Printable Hard Sudoku

Set 1c6p1tl. 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 5 7 3 8
7 4 2
6 7
8 4 1 2 3 7
2 3 5
1 9 7
7 5 8
5
8 1 7
Hard #2
1 5 2
2 1
4 5 9
8 9 1
8 5 7 3
4 5 6 1
5 4 8 2 3
9 6 7
7 9
Hard #3
7 6 5 3 2
2 7
8 2 9 5 7
1 8 6
5 3 8
3 8 6
4 1
5 7 4
9 1 5
Hard #4
8 1 7 4 3 5
3
3 4 9 7
7 5
2 1 6
6 1 4
9 3
9 3 5 2 6 1
5 8
Hard #5
1 4
3 4 8 2 7
4 3 5
1 7
7 2 9 4
6
3 7 4
6 2 4 1
9 7 5 1 3
Hard #6
1 5 9
6 9 7
4 8 2
6 9 5
3 5
2 1 8
2 7 3 6
9 6
4 1 2 8 7 3
Hard #7
2 6
1 2
4 5 7
1 8 3
7 6 9 3
3 4 2 1
6 3 8 7
9 2 5
1 8 3 6
Hard #8
2 1 9 6
9 6 3
8 5 3 7 2
2 9 7
7 1
5 6 2
6 8 1
3 8 1
7 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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