Printable Hard Sudoku

Set 4r6iz5. 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
6
9 6 3 5
5 4 7 6 3 1 2
7 5
5 9 3
2 1 5 4
7 9 1
3 6 8
1 4
Hard #2
4 5 2 9
9 7 4
6 1 4 5 9 8
9 2 3
7 3 4 6
8 5
4 6 8
7
5 3 2
Hard #3
6 1 2 8
5 4
5 2 8 6 1 3
2 3 5
3 1 9
9 1
2 7 4 8
2 7
1 4 2
Hard #4
4 7 6
3 5
3 5 9
9 8 6 1
7 2 4
3 5 1
8 4 9 2 1
5 2 4
1 6 2
Hard #5
3 1 2
9 8
2 3 4 6
8 9 3 6
7 6 9
1 4 7 9
3
8 7 4 9
9 8 5 7
Hard #6
6 1 7 3
6 4 9
8 7 6 2
1 8 2
7 2 4 8 5 6
1 4 3 2 7
5 9
5 2
Hard #7
1 7
8 4 3
2 3 8 5
2 1 4 5
4 6 8
4 8
1 3 7 2
6 8 5
7 5 2 1
Hard #8
7 2
8 5 4
7 2 9 8
3 2 6 5
4
1 2 7 9 4
8 4 2 7
4 1 9
9 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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