Printable Hard Sudoku

Set 4w3j6e. 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
2 6 9
3 4 1 7 6
9 6 4 3
5 6 4 3
8
7 5
8 7 5 4
1 4 6 7
9 8
Hard #2
4 8 9
6 5 4
8
9 2 8
4 5 9
6 2 7 1
9 6 7
3 4 5 1
1 6 9 5 2
Hard #3
1 9 3 5
8 3 1 6 9
7 2 4 1
5 9 2
5
8 1 4 7
6 2 8 4
1
3 7 8
Hard #4
2 7 3
6 5 8
9 7 5 2
9 4 1 7
2 8 3 5 1
6
8 1 9
6 5 9 8
1 2
Hard #5
6 8 5
3 4
4 9 6 3
1 2
9 5 7 6 1
8 6 7 3
1 8 9 4
6 2 8
8 7
Hard #6
2 8
2 1 9 7
9 7 1
4 3
7 5 1
3 8 1 2
1 4 5 6
3 5 9
6 4 9 7
Hard #7
9 3 7 6 8
8 9 2
2 4 8 7
1 2 3
5 9 7 6
7 4
3 9
6 7 1
3 9 5
Hard #8
4 9 2 6
4 2 8 3
7 8 6
6 8 1 9
3 1 5
8 6 7 3
3 5 7
4 9 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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