Printable Hard Sudoku

Set 1merzv6. 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
1 8
5 9 2
3 4 9 5
2 1 9 5
6 7
8 4 3 7 2
5 6 1
6 3 8 4
7 9
Hard #2
3 2 6 4
3 1
7 6 1 5 4 8
5 3 2
6 4 5 7
8 7 9
9 2 6 4
8 4
7
Hard #3
2 8 4 7 9
8 4
5 4 2
5 1
1 6 5
2
6 7 3 4
8 4 3 5
4 7 9 2 6
Hard #4
7 2 8 9 1
8 9 6 2 5 3
8 9
7 6 3
4 2
9 1
5 8
1 3 7
6 3 2 5
Hard #5
2
9 8 2 4
5 7 1 8
3 7 8 9
8 6
7 4 8 5
6
3 5 8 9 7 1
3 4 9
Hard #6
6 5 8 3
2 3
7 6 1
3 9 6 7 5 1
1 9 6
1 4 5
3 1 2 9
5
2 7 9
Hard #7
5 4 2 1
4 6 9
5 4
8 4 9
7
9 8 7 1 3
1 8 2 3 9
7 1 8 5
6 4
Hard #8
5 8
3 2 4
8 9 6 1
8 9 4 6
7 3 5
4 2 6 8 7
2
7 4 5 9
8 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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