To play , you must transition from basic counting to advanced logical deduction. While Sudoku is often viewed as a game of simple placement, the most efficient players treat it as a disciplined process of elimination.
Advanced puzzles are designed so that no number can be placed without deducing the state of other cells. You must pencil in "candidates"—the potential numbers for each cell. However, the mistake many intermediates make is filling in every candidate in every cell. sudoku 129 better
Once you identify a few "indexed" numbers, it can lead to a rapid chain reaction of placements that wouldn't be possible in a standard puzzle Sudoku 247 Hybrid Solving: To play , you must transition from basic