Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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