Printable Hard Sudoku

Set 1yw4rqx. 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 1
5 6 2 1
2 8 1 9 4
9 6 5 7
5 1
3 6 2
2 3
7 4 9
4 6 8 1
Hard #2
6 3 7
3 6 7 5 8
7 8 9 3
6
2 8 7 5
2 3
3 1 4
6 5 2
2 4 9 5
Hard #3
8 4
7 5 2 4 6
6 7 9
1 7 4 6
6 9
3 4 9 2
1 5 8
8 1 6 3
7 4
Hard #4
2 8 4
4 9 2 6
9 3 7
2 4 5
8 7 4
5 3 1 2 8
9 4
5 9
9 7 2 3
Hard #5
1 8
4 7 6 3
6 3 8
2 7 5 6
9
5 8 7
4 3 1 7 9
2 9 3
3 1 2 4
Hard #6
4 2
7 5 6
9 1 7 3 5
2 1 9
8 6 1
6 7 3 9 4
7 9 5
8 3 9
8 9
Hard #7
6 3
9 7 3 5 4
3 6 8 2
4 9
5 2 7
7 9 8
5 9 7
1 2 9
6 2 7 1
Hard #8
2 5 8
7 5
1 6 8 7
8 3 2
7 4 8 2
5 2 8 6 9
2 9 6
9 7 4
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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