0 A.D. Guide, Chapter IV: Dynamic Territories, Technologies and Phases.

 0 A.D. features the traditional real-time strategy gameplay components of building a base, developing an economy, training an army, engaging in combat, and researching new technologies.

The game includes multiple units and buildings specific to each civilization as well as both land and naval units.

During the game, the player advances from "village phase", to "town phase", to "city phase". The phases represent the sizes of settlements in history, and every phase unlocks new units, buildings, and technologies.

Multiplayer functionality is implemented using peer-to-peer networking, without a central server.

0 A.D. Guide, Chapter IV: Dynamic Territories, Technologies and Phases.

Dynamic Territories.

Most buildings can only be built within your own territory, marked by colored borders on the ground. Players can expand their territory by constructing buildings near their borders. (Some types of buildings will expand your territory more than others.) Borders may change throughout the game, based upon the buildings built and destroyed by the players.

If one of a player’s buildings falls into enemy territory due to shifting borders, then the building will slowly lose loyalty until finally converting to the enemy’s side. This can be stopped and slowly reversed if the border shifts and the building comes back to the player’s side.
Important Exceptions

There are a few important exceptions to this rule:

    Outposts, Docks and Roman Entrenched Army Camps can be built outside your borders, but none of these will gain you new territory;
    The Civil Center can be built either on your territory or on unclaimed territory, but must be built a certain distance away from your existing civil centers. Building a civil center can gain you lots of extra territory. Moreover, as you progress through different phases of the game (see “Technologies and Game Phases”), the territory controlled by your Civic Centers will expand by a small amount.

Docks do not lose loyalty/health outside your territory, but Outposts and Roman Entrenched Army Camps do. Roman Entrenched Army Camps can also be built in enemy territory.

Technologies and Phases.

Technologies

Technologies, or techs, are economic or military bonuses that can be “researched” (bought) for resources at designated buildings. Hover over the technology buttons to learn about the costs and benefits of each technology.

In 0 A.D., some technologies come in mutually exclusive pairs: This means that within each pair, you can either research one technology or the other, but not both in the same game. These technology pairs are represented on your screen by a link symbol “connecting” two buttons.
Phases

0 A.D. describes the progression of a city from humble beginnings to greatness in three phases: the Village Phase, the Town Phase, and the City Phase. When the game starts, you are already in the Village Phase. If you want to progress to the Town and City Phases, you need to research each of these at the Civic Center.

Phases are like technologies, but much more valuable, because by reaching a new phase you unlock many new types of buildings, units and technologies. Researching each phase is not only expensive but also requires you to have constructed certain buildings:

    Advancing to the Town Phase costs 500 Food, 500 Wood, and requires having built five buildings of any type, except palisades and farm fields. (Five houses, for example, are sufficient, and so are three houses, a mill and a farmstead.)
    Advancing to the City Phase costs 1000 Stone and 1000 Metal, and requires having built four buildings of any type that becomes available in the Town Phase (except Walls and Civ Centers).

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About Giampaolo Rossi.

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