The expression alludes to something that remains valuable or relevant even after a significant period has passed. A puzzle of this nature, therefore, implies a design or theme that continues to resonate with solvers despite evolving trends and preferences.
The enduring appeal of certain puzzles highlights fundamental qualities of good design: cleverness, clarity, and engagement. Such puzzles often possess universal themes or constructions that do not rely on ephemeral references, allowing solvers from different eras to appreciate them. This longevity reinforces their status as classics within the puzzling community, demonstrating the power of thoughtful creation.