Printable Hard Sudoku

Set 1w66mux. 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 2 4
5 6 7 1
9 6 7
2 4 8
7 9
4 1 9
9 4 3
7 2 8 5
6 7 4 2
Hard #2
8 6 3 5
1 6 9
9 7 2
3 1 9 4
7 6 2 8
5 4 1
7 2 1
3 1 4
5 4
Hard #3
2 6 3
5 4 9 1 2
5
4 3 8 9
6 8
7 3 4
4 7 9 1
2 8 9
9 2 8 5
Hard #4
7 2 5 1
9 8 3 6 2
2 3
7 8 2
2 9 1 8
1 3
4 2
5 4 7 3
1 6 3
Hard #5
3
8 1 4 6
1 5 2 8
1 4 5
3 1 7
2 7 8 4
7 1 4
4 1 7
3 5 6 2
Hard #6
6 4
8 1 3
3 5 7 9 8 1
5 8 9 3 4
2 5 7
4 1 3
9 3 6
4 5 2
7
Hard #7
3 2 9 7 1
6 5 7 8
2 6
4 7 9
6 7 1
3 5 6
9 1 4 2
1 9 3
7 8
Hard #8
3 2 4
5 3 4 1 9
7
5 4 2 3
7 3 9 8
2 6 3 9
6 9 7
9 7
3 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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