Sudoku 129 Better __exclusive__
: A technique where you only mark a digit in a box if it can only go in exactly two cells. This keeps the grid clean while highlighting "conjugate pairs".
. To get better at these puzzles, you must master both foundational scanning and advanced elimination logic. Master the Core Rules The goal is to fill a grid so that every sub-grid (nonet) contains the digits 1 through 9 exactly once. The Rule of 45 : Each row, column, and block must sum to 45 ( Unique Solution : Every valid Sudoku puzzle has only one correct solution. Scanning Techniques for Speed
: An advanced strategy where you track "strong" and "weak" links between candidates across cells. If a sequence of logic leads to a contradiction (e.g., a cell both must and cannot be a 9), you can eliminate that candidate. Hidden Pairs
Solve 10 "Hard" puzzles, but restrict yourself: Do not use any strategy except XY-Wing and hidden singles. If you can't spot an XY-Wing, stare at the grid for 5 minutes. This forces pattern recognition.
