On your turn, play exactly one card from your hand and carry out its action. The played card lands face up on your personal discard pile — your hand shrinks turn after turn until a Tribune calls everything home. The starting hand:
- Tribune — take all your played cards back into your hand, earning 1 sestertius per card recovered beyond the third; then you may pay 1 food + 1 tool to move a colonist from your storehouse into Roma.
- Architect — you get one movement step per colonist you have on the board, split freely among them: land colonists walk the brown routes, sea colonists sail the blue. Then build houses in cities adjacent to any of your colonists. Each house costs the city's goods (1 food in a brick city; 1 brick plus the city's own good everywhere else) plus coins — 1/2/3/4/5 sestertii in brick/food/tool/wine/cloth cities, multiplied by the total number of houses in that city after yours. One house per city, and never in Roma.
- Prefect — pick a province and either produce — you pocket the good on its bonus marker and flip the marker to its coin side, and every house in the province, whoever owns it, produces its city's good — or take the cash: collect 1 sestertius per coin showing across all bonus markers, then flip them all back to their goods sides.
- Mercator — gain 3 sestertii (purchased Mercator cards give 5), then buy and/or sell up to two types of goods with the bank at the fixed prices printed on your storehouse roof.
- Senator — buy up to two cards from the display into your hand, each costing its printed goods plus the goods under its display slot (a ? means any good you choose); afterwards the display slides left and refills to 7.
- Diplomat — copy the action of the card on top of another player's discard pile.
The 30 cards on sale add three more actions: Colonist (place new colonists for 1 food + 1 tool each into Roma or any city where you own a house — or take 5 sestertii plus 1 per colonist you have on the board), Consul (buy one card ignoring the display-slot surcharge), and the Specialists — Mason, Farmer, Smith, Vintner, Weaver — each of which makes all your houses of one goods type produce. And whoever holds Praefectus Magnus doubles the bonus good when playing a Prefect to produce, then passes the card to the right.
A round in practice. Ana plays a Prefect on Hispania: she takes the wine shown on its bonus marker, flips the marker to its coin side, and every house there produces — including Beto's, which earns him a cloth on Ana's turn. Beto plays his Architect: four colonists on the board give him four steps, so he walks a land colonist two steps to a tool city and builds, paying 1 brick, 1 tool, and 3 sestertii. Carla plays a Senator and buys a Vintner and a Colonist from the display, paying each card's printed goods plus the surcharge under its slot. Diego, down to his last card, plays the Tribune: seven cards return to his hand (the Tribune counts too), he collects 4 sestertii for the four beyond the third, and pays 1 food + 1 tool to land a fresh colonist in Roma.