Printable Hard Sudoku

Set 1d3k1a4. 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
7 4 3 2 1
1 7 9 4 8
8 3 6 2
7
9 2 1 8
6 2 5
7 1 8
3 8 4
Hard #2
9 3
3 5 2
7
2 3 5 9 6
1 9 2 5
6 5 4 3
6 3 7
8 2 4 6
5 7 8
Hard #3
6 3 2 8
1 2 4
3 4 7 1
3 7 2
9 1
9 7 5
6 1 5 7
4 1 5
6 7 9
Hard #4
7 3 6 5 8
8 3 6 7
4 1
3 1 8 9
4 6 7
5 2 4 8
8
7 9
7 6 1 2
Hard #5
4 2 3 6 7
3 7
3
7 5 9 6 3
6 2 9
5 8
4 1 3
2 9 7 3 6
4 2 8
Hard #6
7 4 5 6
2 1
6 4 3 1 9
9 2 4
5 8 3 6
9 5
7 1 5 3
9 8 7
4 9
Hard #7
4 7 3
8 5 1
3 6 2 7
1 2
2 4 8 5
7 5 6
2 6 8
1 8 9
5 7 3 6
Hard #8
2 5 4 7
1 6 9
3 4
4 3 9 1
9 7 4 1
5 7 2 4
8 9 7 6
7 4 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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