Printable Hard Sudoku

Set 2ts3x2. 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
9 8 2 5
2 7 9
1 5 7
2 7 6 9 8 1
7 8 3
6
5 4 6 1 2
5
9 3 4
Hard #2
7 5 8
2 8 4
1 4 9
2 9
2 3 4 1 7
4 6
1 2
1 5 7 8 4
6 7 5 1
Hard #3
4 8 5 7
8 3 5
2 9 4
9 7 1
7 2 9
4 9 3
3 6
7 2 8 5
5 4 2 6
Hard #4
3 8 9 4
4 7 3
9 2 1
3 7 9
4 9 1 2
5 2 7
1 2 8
8 6 2 5 3
5
Hard #5
9
6 9 8
4 2 3
7 4 1 8 2
5 9 6 7
2 8 7 1
2 9 7 3 4
7
5 1 7
Hard #6
1 6 5 2
3 1 7
7 4 9
8 5
9 5 4 6 2
8 3 5
3 4 8
2 9
6 1 4 8
Hard #7
2 7 8
2
1 8 2 6
9 5 3 7
8 3 6
1 3 8
9 7 3 5
2 5
5 2 9 4 8
Hard #8
9
3 4 8
2 7 1
9
8 7 5
1 6 4 5 2
4 5 3 9
8 9 2 6 3
3 4 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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