Castles is a video game developed by Quicksilver and published by Interplay Entertainment in 1991 and 1992. The game involves the construction of a series of castles on the western coast of England during the 11th century. Castles was quickly followed by an expansion, Castles: The Northern Campaign, and a sequel, Castles II: Siege and Conquest.
The game combines several genres of gameplay including resource management, a text-based multiple-choice storyline and a simple combat mode.
In Castles, the player constructs up to eight castles, one after the other, in various regions in western England and Wales. Each scenario starts in the castle building mode with a flat, empty map of the region. The map has such features as trees and water, but is largely devoid of manageable terrain.
On this map the player designs the outline of a castle, including a gatehouse, walls, and round or square towers. Each piece of the castle can be customized for either height, thickness, or both, and most can be further outfitted with defensive features. Wall defenses feature cauldrons of boiling oil and towers include arrow slits. The player has to consider the amount of available resources in the region when designing the castle, as larger or numerous pieces can easily deplete resources and result in the inability to complete the castle.
Source: Wikipedia, "Castles (video game)", available under the CC-BY-SA License.