Printable Hard Sudoku

Set i34yzo. 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
3 4 5
8 7 6 1
2 6
2 9 4 8 3
8 5
6 7 2
7 2 1 4
8 7
5 6 1 2
Hard #2
1 6 9
3 4 7 2
7 8
3 5
2 9 5 7
2 9 4
4 6 3 8 1
1 2 5 4
3 8
Hard #3
6 5 7 1
1 5 8
6 7 5 8
8 7 4 6
6 7 3 2
1
4 2 5
4 5 9 3 8 1
Hard #4
5 2 7
7 9 1
1 9 7 3 8
1 4 6 2 8
6 7 4
1 8
9
1 8 2 3 7
2 4
Hard #5
9 1
5 3 4 2
7 9 4
7 8 5
4 6 7
5 2 3 4 1
6 7 8
1 9 8 4
9 3
Hard #6
2 4 5 9
8 6 2 3 7
9 7
1
2 6 5
8 9
3 4 1 8 6
1 2 4
7 4 3 1
Hard #7
5 1 2
7
8 2 6 9 1 3
3 8
5 1 8 4
3
1 6 9 5 4
2 3 7 4 5 1
9
Hard #8
5 9 2
7 5 4
6 3 8 7
7 1 8
4 7 6 1
1 2 7 5
5 3
2 7 9
9 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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