In the game Walls of York, players must use the plastic wall pieces to construct a defensive barrier around the buildings on their city map. Each turn, a player rolls the building die, which dictates which types of walls are to be used. Players must enclose their city, containing the required buildings from the King's decree — but players must beware for the Vikings will come and lay waste at the end of the first age, forcing players to build anew in the second age. The player with the most coins at the end of the second age wins.