Printable Hard Sudoku

Set 4wzqt5. 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
1 8 2 7
6 8
9 1 4 8
6 8 3
3 4 5 2
6 9
6 3 7
7 5
4 5 9 1 2
Hard #2
8 9 4 2 7 6
4 3 6 8 5
7 2 3 8
9
8 4 3
2 1
6
5 4
7 9 8 3 6
Hard #3
8 1 7
5 7 4
8 3 5 6
8 4 6 9
5 2 9
2 5 6
3 4 9
2 9
6 1 7 8
Hard #4
4 7 8
9 6
5 1
9 1 6 8 3
5 3 2 1 7
3 9 2
7 8 2
8
9 2 1 7 6
Hard #5
4 7
2 3 4 7 6
8 9 5 4
4 8
2 6 7
7 5 2 6 3
3 8 5
6 3 1 5 2
Hard #6
7 6 9 8 5
9 8 7
3 2 4
7 5 1 4 3
3 4 2
5 9
5 1 7 4
4 2
3 9
Hard #7
1 6 9 7
8 9 7 6
9 8
1 4 3 5 7
4 5
3 9
5 3
2 1 6 5 8
3 2 6
Hard #8
5 3 9
7 2 8 1
4 3 6
8
4 7 2 1
3 1 6 4
8 4 6
1 3
3 7 8 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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