Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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