Printable Hard Sudoku

Set 1q4gnvg. 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
4 3 6 2 9
5 2 1
7 9 3 5 4
1 5 9 3
2
4 7 6
9
7 8 3 5
8 5 6
Hard #2
3 6 1
1 9 7
5 2 4 9
2 8 3 4 6
6 1 4
9 2
1 9
4 5 1 3
9 7 2
Hard #3
1 3 6 4
4
7 5 9
4 9 3 7
7 9 5 6
5 2 4 3 8
1 7
8 6
6 2 8 7
Hard #4
7 8
9 5 3 6
7 6 1 4 9
3 8 6
4
8 4 1 3
2 9
6 9 3 7 4
7 1 6
Hard #5
5 7 1
2 4
4 5 3
2 3 8
7 4 6 8 2
1 7 5
9 1 3
3 1 5 8
2 6 5
Hard #6
5 8 6
6 4 5 3 1
4 2
3 7 8
9 1 4
1 6 3 7
8 4 7
9
8 7 2 5 3
Hard #7
3 9
5 3 8 2 4
9 5 7 1
4 3 6 7
3
2 1 6
6 1
2 1 4
3 5 7 6 4
Hard #8
5 1
1 6 9 2 7 8
7 9 1
2 4 5
3 6 2
7 6 8
6 5
4 9 3
5 3 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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