Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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