High-level game players joining the kakuro craze will learn the logic, understand the math, develop solving methods, and even devise some tricks of their own. And thanks to "Masters Kakuro, " they can continue to challenge themselves with increasingly difficult puzzles. Ranging from difficult to very difficult to insanely difficult, "Masters Kakuro's" 172 puzzles comprise the most challenging collection in any book. The puzzles have large grids and extensive cross-sections that thwart simple trial-and-error players with endless combinations. Yet every puzzle in "Masters Kakuro" has only one correct solution that can be determined with superior logic and excellent gaming strategy.