Printable Hard Sudoku

Set 1ewse90. 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 4 6 7
7 5 9
8 6
5 2 7
6 9 8
6 1 2
3 7 8 1 5
5 7 2
2 9 4
Hard #2
5 6 7 2
2
7 9 4
2 1 6
4 1 8
6 4 1 3
7 5 3
1 7 2 9 4
4 6 7
Hard #3
1 6 9 4
8 6 3
2 4 9 7
7 2 1 5
4 8 5
4 6
7 2 5 3
5 6 3 7 8
Hard #4
9 8 4 2 7
3 9 8
7 8 2
7 4 5
8 3
2 9 1 7
7 1
9 3 6 5
9 3 4
Hard #5
4 3 8 9
3 8 4
8 1 7 3 4
9 2 6
4
8 7 1 4
8 5
2 5 1 6
3 7 8
Hard #6
1 2
2 3 8 5 1
8 2
9 8 7
1 6 8 2
5 4 3 9
2 5 3 8
4 2
5 7 9
Hard #7
8 2 1 6
8 4 7
5 6 2
6 5 9 1 4
4 9
2 5 6 8
3 4
5 1
1 6 7 5
Hard #8
6 2 5
4 2
1 9
2 7 8 3 6
1 8 4
3 6 4 9
6 7
6 9 3
2 8 5 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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