The expression describes a puzzle, usually a crossword, characterised by its substantial problem and complexity. It suggests a puzzle that’s difficult to resolve, requiring appreciable effort and information from the solver. For instance, a particular themed crossword with obscure vocabulary and complicated wordplay is perhaps characterised utilizing this phrase.
Such puzzles present a big cognitive exercise, stimulating problem-solving expertise and increasing vocabulary. They’ll supply a way of accomplishment upon completion as a result of problem concerned. Crosswords of this nature have existed for many years, evolving from less complicated phrase puzzles to extra complicated and difficult constructions, reflecting rising solver talent and expectations.
