Mayfair Games - Catan: Cities & Knights Expansion for Settlers of Catan. Expand Catan with a more complex commodity market and knights to defend your cities. New in Shrink Wrap With Same Shelf Wear and Small Tare. See last Two Pictures This third expansion for The Settlers of Catan. It shifts the focus of the original game away from expansion and toward city-building. Cities now produce commodities, can gain special privileges, and eventually become metropolises. The expansion is often considered the most advanced scenario for Settlers. Cities & Knights is notorious for its inability to combine well with other scenarios and variants.