Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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