Printable Hard Sudoku

Set 1auwgn2. 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 5 7 1 3
1 9 8 5
8
3 2 6
9 7 8
7 9
2 3
4 7 3 8 9
3 6 5 4
Hard #2
4 2 8 1 6
7 6 2 1
2
9 4 6 1
8 1 3
2 3 8
6
1 8 4 5 9
5 3 9
Hard #3
6 2 8 1 5 3
4
7 5 6 1
6 2 9 8
8 3 4 9
5 1
7 9
3 5
9 8 1 6
Hard #4
6 1 4
3 5
2 4 7 5
5 4
2 1
3 4 1
1 5 9 7
5 7 9 4 6
6 3 2 1
Hard #5
4 3
3 8 4 6
6 1 7
5 3 6 7
6 9 1 4
9 4 2 3
1 7
9 5 3 8
8 1
Hard #6
1 2 6
5 9 7 1 4
4 8 9
8
4 1 3 2
2 9 5 6
1 7 4 2
7 5
4 3 1
Hard #7
4 5 6 7 1
9 4 3
5 2
6 7 9 1
8 2
1 2 5 9
7 3 1 4
3 6
2 8 5
Hard #8
2 6 8
7 2
4 1 5
2 3 5 7 4
5 4 6 7 3
8 9 6
9 1
8 6 7
7 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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