Printable Hard Sudoku

Set 1ew21zh. 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
6 7
3 6 2 5 8
8 1 6
9
2 1 5 6
7 4 9 3
2 5 4
1 4 7
4 7 3 2
Hard #2
6 2 5
1 5 6
3 5 7 9 4 1
6 8
9 3
1 4 8
8 7 3 1 9
5 6
9 3 4
Hard #3
9 7 5 1
8 3 6
1 4 8
1 6 5
3
2 3 5 9 1
6 7 9 5
7 2 4 1
2 8
Hard #4
9 6 4 3 2
1 6
4 8 6 5
5 2 4 7 8
1 8 9 7
6 3
4 5
3 7 2 6 9
Hard #5
9
5 1 8 6
3 1
1 5 3 2
8 6 2 5
2 1 7
1 8 9
7 3 4 1
4 8 6 2
Hard #6
6 1 5 8
8 4 6 1
1 3 2
3 9 8 5 6
3 1
6 9 2
9 8 7
4 3
7 1 9
Hard #7
5 2 4
9 5 8
2 5 7 9
4 8 1
8 3
7 1 9 4 3
3 1 5
8 2 3 6
9 7
Hard #8
4 9 7 1 8
2 3 9
8 4
8 1
1 4 5 2
6 3 9
8 7 3
6 3 2 5
7 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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