Techniques cluster
Sudoku techniques, one page at a time
Each technique gets its own page, its own explanation, and a clear route back into the board so you can read a pattern and practice it straight away.
Keep learning
Technique pages
Open the technique that matches what you want to practice next, then jump back into a live board.
Hidden Singles
Learn how hidden singles work, when to scan for them, and how to practice them on a live Sudoku board.
Naked Pairs
Understand naked pairs in Sudoku, when they matter, and how they help clear clutter from rows, columns, and boxes.
X-Wing
Learn what the X-Wing technique is, when to use it, and how to explain it in a way that players can actually follow.
Swordfish
An advanced Swordfish page showing how bigger candidate patterns fit into a full learning cluster.