Printable Hard Sudoku

Set qoh2k2. 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 1 2
3 5 9 6
8 9 4
7 5
1 5 6
3 9 2 7 8
9 3 7 4 6
6 8 4 3
Hard #2
1 8 6 3
6 7 8
2 7 5
1 6 3
4 5
8 7 6 5
3 8 4 2
9 6
8 3 1 5
Hard #3
9
5 4
4 3 9 1
3 6 8 5
7 9 6
9 3
3 4 5 1 8
6 5 7 3 2
2 3 9
Hard #4
9 1 8 5 6
3 2 1 7
2 1 4 5
7 8 6
2 7
5 1 8
8
6 5 3 9
6 2 7
Hard #5
4 5 6 3 9
8 1 2
3 5 1
1 5
6 5 9
7 3
2 7 3 6 4
9 4 8
3 7 5
Hard #6
7 6 1 9
2 5 3 6 8
4 3
6 4 7
4 9
8 2 9
9 6 8 3 4
1 3 2 6 8
Hard #7
6 1 8
2 1 4 9 7
7 2 5
1
5 3
2 8 1 4
4 1 7 5 6
8 4
9 8 6 1
Hard #8
3 7 2
7 5 6 9 4 8
9 8 7 6
7 5
9 3 8 7
1 4 3
2
3 6 7
7 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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