Printable Hard Sudoku

Set bk4ng8. 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
6 9
9 7 6 3
2 4 7
8 4 2 1
1 3
4 6 8
5 9
3 9 8 2
8 6 5 2 3
Hard #2
9 4 3 5
9 4 3
6 8 5 7
2 3 9 5 7
3 7 5 8
8 2 4
2 1
2 8
1 6
Hard #3
5 2 7 1 8
4 8 9
4 3
8 9
2 7 4 3
4 3 5 7
8 9 6
1 6 5
3 7 9
Hard #4
9 2
3 1 8
7 8 4 9 2
5 4 2
9 8 7 6
1 5 4
4 5 6 1
3 1 5
9 4
Hard #5
6 3
4 9
2 5 7
3 7 8 2 1 9
8 9 3 5
2 1 6
7 6 2
5 1
3 7 1 5
Hard #6
8 3 4 1 6
6 5
2 3 9
4 6 8
9 8 4 5 1 2 7
7 9
2 5 9 1
7 5 8
Hard #7
2 1 9 4
4 2 3
6 8
9 1 5 6
7 2 3
2 4 8 5
6 4 1 7
5 3 7
2 8
Hard #8
9 4
1 6 4 7
8 7 2 3 9
9 7
5 2 6
7 3 8 4
5 8 3 1 6
5 2
5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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