Sudoku 129 Better File

To solve "Hard" or "Expert" levels, you must master techniques that eliminate candidates rather than just searching for empty spots:

: Look for rows, columns, or blocks with 6 or 7 digits already filled. List the missing numbers (e.g., 1, 5, and 9) and check intersecting lines to see if two of those digits can be ruled out for a specific cell, leaving a "naked single". 2. Specialized Strategies for "Better" Solving sudoku 129 better