player may take an action for each of their cities. Each city may either produce a unit or building, gain culture points, or harvest resources. Each city may produce a figure or an unlocked unit or building costing an amount less than or equal to the number of production points in the spaces surrounding their city (hammers). Production points may not be pooled between cities, and any production points in excess of the number of points needed is lost. Like trade, scout units may also gather production for a city, and enemy units may prevent a city from accessing production points. Trade points may also be exchanged for production points. Cities devoting to the arts generate culture points rather than production, and like trade points, culture points are pooled so that they may be spent advancing a civilization's culture levels. Advancing culture levels allows players to gain culture event cards, which provide certain one-time bonuses, or Great People, which act as improved versions of buildings that may be moved between cities. Cities harvesting resources gain the resource that they harvest, which may then be spent on resource-based abilities granted by technologies. As with other forms of production, scouts may harvest on behalf of a city, and the harvesting of resources may be blockaded by enemy units. In the Movement Phase, players may move their armies and scouts a number of spaces on the board. The number of spaces that may be travelled is based on the technologies the players have researched. Movement may be constrained by the presence of water, depending on the technologies researched, and there is a limit on the number of units that may occupy a single space on the board. Units may also move onto a face-down map tile, turning it face up. Certain spaces on the map contain huts and villages, which represent passive and aggressive barbarians, which grant resources on discovery. Players may also engage in military conflicts with another player during this phase, with the winner of the battle being able to take assets belonging to the loser as a reward. In the Research Phase, players may spend trade points to research new technologies. This phase is performed simultaneously by all players. Each technology is organized into a number of ages, and technology research is governed by the "tech pyramid": new "Age I" technologies may be researched at any time, and the number