Welcome to the pure-sudoku documentation

If you are new to Sudoku, you can begin with Introduction to Sudoku and Single Techniques. Here are some intermediate and advanced techniques.

Subsets

Naked Quadruple

Hidden Quadruple

Intersection

Locked Candidates

Basic Fish

X-Wing (2-Fish)

Swordfish (3-Fish)

Jellyfish (4-Fish)

Same-Digit Two-Strong-Link Chains

Two-String Kite

Empty Rectangle

Wings