Printable Hard Sudoku

Set 1kv4qa6. 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
5 4 2 6
2 1 6 5 9
4 2 3
3 8 1 5
6 5 4
8
6 2 4 1 9
7 8 6
5
Hard #2
7 3
5 1
5 9 8
2 5
2 6 8 7 3
5 1 4 6
3 5 7
1 2
6 8 2 9 5 1
Hard #3
2 4 3
1 7 5 9
6 4 3 1
8 9 1
6 3
3 9 8 6 5
3 1 2 7
5 8 7 3
Hard #4
5 4
4 3 7 9
9 6 3
9 5
1 5 8 2 4
5 3 4 7 2 8
9 4
1 8 5
6 2
Hard #5
5 3 8 4
4 6
3 9 2 5 1
7 3 1
8 9
2 4 8 7
1 6 4 7 2
1 7 6
7
Hard #6
2 8
9 1 2 4 6
7 4 9
2 5 7 6
6 5 4 3
4 9 8
5
8 1
8 3 6 1 9
Hard #7
6 2 8 3 7
4
3 8 6
8 1 3 6
1 7 8
6 7 5 1
5 2 6 4
4 2
7 5 4
Hard #8
2 5
9 6 3
3 6 2 7
5 8 4
2 7 4
8 6 5 7
5 7
1 6 4
4 9 1 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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