Sudoku solving

Sudoku solving involves filling a 9x9 grid with numbers so that each row, column, and 3x3 subgrid contains all digits from 1 to 9 exactly once. The process uses logical deduction to determine which numbers fit where, based on what is already placed. Solvers look at partial placements, identify missing numbers, and eliminate options until only one possibility remains for each cell. Techniques include scanning for obvious placements, pencil-marking possible numbers, and applying logical strategies like scanning, cross-hatching, and candidate elimination. The goal is to methodically narrow options until the entire grid is correctly filled.