A level 8 Imperius capital.

Cities are the basic unit of a player's empire in Polytopia. Cities produce income and are worth 100 points per level, and units can be trained in cities. Each tribe starts with one city, its capital, and additional cities are acquired from capturing villages or enemy cities. Cities that are under siege by an enemy unit do not produce income. A player is eliminated when they have lost all of their cities.

Cities can be upgraded by increasing population (harvesting resources, constructing buildings, or forming city connections). Each time a city levels up, the city's increases by one star per turn and a choice between two bonuses is offered, such as choosing between a workshop or an explorer.

Units with the fortify skill receive a defence bonus in cities. Cities with a city wall provide a significantly stronger defence bonus.

Cities are visually comprised of city buildings. Capitals have a city castle on top of its front building. Workshop and Park are visual.

Your capital can also be identified by a little crown image next to the city name. Cities connected to the capital will have a road symbol in the same place, whereas cities that aren't connected will have no symbol there.

It is also important to note that the amount of cities you own influences the prices of tech on the Technology Tree. 1 star per extra city for Tier 1, 2 stars per extra city on Tier 2 and 3 stars on Tier 3 techs.

Territory

Territory is the area surrounding a city that belongs to a tribe. Buildings may only be constructed in this area (with the exception of Roads, which can be built in unclaimed territories as well). Units, however, can only be trained in the city itself. Territory is marked by a dashed line with the color of the owner's tribe. Territory borders can be expanded once a city reaches level 4, when the player is given the option to expand borders.

The territory around a city is a 3x3 square with the city in the core tile, giving the player a total of 8 workable tiles to start with. If borders are expanded once level 4 is reached, the territory becomes a 5x5 square, increasing owned workable tiles to 24.

If two cities are close to each other, territory will be claimed by the first to emerge. For example, if two villages are located close to each other and one is captured, it will occupy the usual 3x3 square once founded and 5x5 once upgraded, even if it takes over the potential tiles that would be within the other city's sphere of influence had it not claimed it. Once the second village is converted into a city, it will claim all tiles within that 3x3 square that have not yet been taken by another city, with the same happening during border expansion. Once the territory is defined, it cannot be exchanged between the cities. This remains true whether the cities belong to the same tribe or to different ones.

City Upgrade Bonuses

To Level 2 To Level 3 To Level 4 To Level 5+
Population needed to upgrade 2 3 4 n
Bonus points for upgrading

(always = 50 with 5 pts per population)

40 35 30 50-n×5
Upgrade Rewards Workshop or Explorer City Wall or Resources (three stars) Population Growth (+3 population) or Border Growth Park or Super Unit
Number of house rows 3 3 3 4

Capital and City Castles

The Capital is the player's starting city. Capitals produce by default 1 more star per turn than other owned cities. Cities can be connected to capitals through the use of roads and ports. Each capital contains a city castle specific to each tribe, that lingers even if the city is captured. (e.g If the Kickoo takes the Oumaji Capital, the Oumaji city castle will still stay there.) The name of the capital is also underlined. Capturing another tribe's capital will disable any trade routes they have in place until the city is taken back.

Gallery of City Castles

City Castles are a decorative structure found in capital cities. Each of them has a cone shape and is decorated with a crown on top, but the rest will vary from tribe to tribe.

City Upgrades
Workshop, Explorer City Wall, Resources Border Growth, Population Growth Park, Super Unit
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