Sudoku
Place the digits 1 to 9 so no row, column or box repeats one.
Rules
- Fill every empty square with a digit from 1 to 9.
- Each row, each column and each of the nine 3×3 boxes contains every digit exactly once.
- The printed digits are fixed. Every puzzle has one solution and never needs a guess.
Difficulty
Difficulty is the hardest technique our solver needed: singles for Gentle, up to X-wings and XY-wings for Fiendish. Every puzzle here has exactly one solution, checked by a program, and can be solved step by step without guessing.
5
6
9
1
7
4
7
3
8
6
1
7
4
3
5
6
2
7
2
6
3
4
5
8
9
1
5
6
3
5
9
8
4
6
Gentle
15 puzzles, loading your progress…
Moderate
15 puzzles, loading your progress…
Tricky
12 puzzles, loading your progress…
Fiendish
8 puzzles, loading your progress…