This collection investigates the limits of linguistic dexterity and lateral thinking through the medium of high-difficulty, jumbo-format cryptic crosswords. Editor Richard Browne, representing The Times Mind Games, curates a selection of fifty puzzles designed to test the analytical capabilities of advanced solvers. The book operates on the premise that standard crossword grids are insufficient for the most dedicated enthusiasts, necessitating a more expansive and complex structural framework.

The framing suggests a rigorous, specialist-level resource intended for solvers who have mastered standard cryptic formats and seek increased grid density. The inclusion of larger 23x23 grids points to a deliberate effort to provide a more sustained and demanding cognitive exercise than typical daily puzzles.