The Times Difficult Su Doku Book 7: 200 challenging puzzles from The Times (The Times Su Doku)

This puzzle collection features 200 previously unpublished "Difficult" Su Doku grids curated by The Times. As the seventh entry in this series, the book offers intermediate players a consistent selection of moderately advanced brain-teasers. Solving these puzzles requires no mathematical calculations, relying instead on pure, step-by-step deductive logic. Every grid is carefully constructed to ensure it contains only one unique solution, eliminating the need for empirical guessing or experimentation. Players can systematically work through the grids to test and refine their logical deduction skills.