GoKawiilMath enthusiast proves only twelve unique 4x4 sudoku grids exist
A blogger explores the combinatorics of 4x4 sudoku puzzles, showing that while there are 288 raw valid grid fillings, many are equivalent under symmetries like digit swapping, rotation, and reflection. Once these symmetries are accounted for, the total collapses to just twelve fundamentally distinct solutions. The post also describes a technique for identifying minimal starting clues needed to uniquely determine a solution.