Printable Hard Sudoku

Set 1w4po0g. 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 6 4 7
1 9 5
4 2
8 3 4 1
4 8 9
9 7 5
1 2 3
3 8 5 6
6 4 1
Hard #2
1 7 9 5 3
4 3
2 5 7 8
4 5 2
3 8 1
2 8 3 6
2 7 9 8
6 4
3 1
Hard #3
3 7
1 5 6
5 8 4 3
4 3 1 9
7 1 6 9 2
7 3
2 5 1
8 4 9
5 7 4
Hard #4
6 2 9
7 8 9 6
4 7
5 1 7 2 9
2 6 3 5
4
3 1 5 4
8 3
9 6 7 5
Hard #5
7 3
2 4 1 8 3
2 6 9 4
4 5 2
9 8 7
7 5 8 1
2 5 7 3
8 2
4 7
Hard #6
6 8
2 4 9
1 8
9 5 2 7
2 1 6
3 8
6 3 9 7
7 3 2
8 9 1 7 3 4
Hard #7
4
1 3 5 4 6
6 9 3 8
1 4
5 8 2 9 7
6 8
2
8 3 2 5 6
1 9 5 7
Hard #8
9 3 2 8 4
7 1 8
6 8 4 2
2 1 6 3
5 6 7
5 6 1 7
3
1 7 9 2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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