Printable Hard Sudoku

Set 1qwvx4w. 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 1 3 9
8 9
5 1
2 1 9 6
8 2 4 3 5
4 7 8
9 4 2 7 8
2 6 4
7
Hard #2
8 5 3 2
1
3 8 7
6 1 2 4
7 1
9 2 4 6
3 4 8 1 5
2 6 9
3 7 4
Hard #3
1 6 4
6 8 1 3 5
2 6 4 7
8 9
2
8 4 3 5 7
9 1 4 8
3
2 5 7 1
Hard #4
1 4 8
6 8 3 7 1
1 9
2 9 7
7 8 2 5 3
4 6
2
4 1 6 9
5 2 4 7
Hard #5
1 7 4 2
6
6 1 9
8 5 7
4 7 3
3 2 5 9 4
3 7 9 5 8
1 8 3
4 6
Hard #6
8 7 1 6
6 9 2
6 5
2 4 8
3 5 7
8 6 7 9 3 1
6 7 9
7 5 4
3 8
Hard #7
2 9
3 5 1
6 5 7 4
4 7 8 5
7 2 9 3
2 7 9
2 4
8 9 2 4 1 5
1
Hard #8
1 3 9 8
8 6 2 5 3
9 5 4
1
4 3 9 7
2 9 7 6 1
8 2
1 8
3 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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