Printable Hard Sudoku

Set 1iu2p9i. 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
8
7 9 8 4 6 3 5
3 8 9
7 3 1
3 5
1 7 2
6 9 7 1
6 4 2
1 4 9
Hard #2
4
7 6 9 3
8 3 7 9 4
3 6 1 5
8 5
5 9 8 7 3
2 3 4
4 9 1
3 5
Hard #3
4 7 8 6
8 1 9 7 4
9 5 3
9 6 1 3
9 3
5 9
4 9
3 9 4 8
5 6 2
Hard #4
5 6 7
9 2
5 3 9 7
5 4 8
2 1
8 3 6 7 4
3 9 5 8
8 3 6
7 8 1
Hard #5
3
2 8 7 6 4
7 3 5 9
9 2
5 9 3 4
7 1 5 9
9 8 2 6 5
6
1 7 9
Hard #6
6 9 5 1 3
6 3 5 1 2
3 9 7
7 3 2
5 4 8 2
3 7 5 2
9 3
1 5 4
Hard #7
7
9 1 4
4 9 1 3 5
1 4 3 6
2 5 8
2 6
2 7 4
9 8 2 5 3
5 4 2
Hard #8
6 4
8 9
5 1 7 2 9
8 1
8 1 3 9
2 5
2 3 1
3 8 5 9 6
2 7 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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