Printable Hard Sudoku

Set lwu5yg. 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 9 2 6
9 5
2 5 8
2 5
5 6 3 4
6 4 8 5
9 3 7
7 1 9 6 3
4 5
Hard #2
4 5
4 5 1 7 8
3 5 2 4
6 3 5
9 1 7
5 7
7 4 6 9
2 8 1 4
1 3
Hard #3
6 8 9
7 8 4
5 2 1
2 6 7 8 3
4
1 5 6
3 1 4 9 6
8 7 1
4 9 8
Hard #4
6 8 5
2 8 9
5 3
9 1
1 7 2 3
4 1 8 5
2 8 5 1
3 6 7 9 4
4 6
Hard #5
2 5 3 9
1
8 7 6 1
8 7 4
7 5
6 1
1 9 7 3 8
9 3 5 4
5 7 8 9
Hard #6
2 5
7 5 4
4 6 3 2
4 7 3
1 9 2 4 7
8 7 4
8 3
6 9
5 4 1 8 3
Hard #7
8 3 9 1 6
4 2 3
9 4 7 5
2 8
8 5 7
9 6 3 2 8
1 9
9 2 8 7
4
Hard #8
8 9 7
9 8 4
5 4 2 9 3
4 3 9
9 8 7 2
2 9
3 4
6 4 3 8
5 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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