Sudoku 129 Better

An expert-level strategy where you trace a chain of "strong" and "weak" links between candidates across different cells. If a loop starts and ends on the same digit with conflicting logic, you can eliminate that digit from the starting cell. Using Sudoku 129 Effectively

contain those two numbers, allowing you to remove all other candidate numbers from those two cells. Sudoku Rules - Strategies, solving techniques and tricks sudoku 129 better

Solve an easy puzzle without any pencil marks, using only memory of eliminated numbers. This builds working memory. An expert-level strategy where you trace a chain

: Video series like Sudoku Primer 129 focus on specialized techniques, such as Diagonal Sudoku , where the 1–9 constraint also applies to the main diagonals. Modern "Better" Alternatives such as Diagonal Sudoku