Printable Hard Sudoku

Set jk4b7g. 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
4 3
2 1 8 6
9 5 4 8
6 8 4 7
3 4 2 6
2
8 3 9 1
3 7 5 2
4 3
Hard #2
5 6 1
1 4 3 2
9 1 3
5 8 6 2
1 5 2 9 6
8 3
7 1 6 8
6 2 5 4
Hard #3
8 4
2 5 4 7
6 3 5 8
7
4 1 9 2
6 4 1 5
5
4 1 8 7 6
2 9 6 8
Hard #4
2 1 3 9
7 6 4
5 7 1 2
8 1 5 6
6 7 9
8 5 1
2 4 7
2 3 9
8 3
Hard #5
1 4 7 6
4 1 8 3
5
2 8 5
2 3 4
9 7 4
4 7 2 9
7 6 1 4
3 6 1
Hard #6
1 8 3
3 6 4 1
9 3 6 5
5 4 7
4 1
9 8 1
5 3 2
9 2
4 7 8 9 1
Hard #7
9 4 1
3 5 7 4
5 6
7 9 6
8 3 1 2 7
6
9 6
6 1 5 2 3
7 3 1 9
Hard #8
6 3 8
8 2 5 7
5
6 8 3 9
2 4 5 1 8
9 7
9 5 7
3 2 4
9 1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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