Centres are officially designated areas in cities that are used for transportation and combat. Participants can deliver a brick or log with 9 products to a city centre from another city centre to collect a force or good token. Products delivered can't match any of the products that the city is able to produce itself, including from structures. Other than that there is no restrictions on the type of products delivered. In combat, centres need to be defended or captured to determine which entity will have sovereignty once the combat is resolved. Each city has a centre, even those inside. Cities inside must have a designated area on the outside of the building to represent its centre. City centres and applicable rules were implemented in NOV24.