The Action Loop - Each zone presents different actions you can take, from gaining upgrades to constructing your subway line.The Market - Skip zones of the action loop to beat your competitors. Taking advantage of discounted resources or your pick of powerful developments.Tight Economy - Carefully manage your budget and resources, balancing your available storage and surge-pricing for resources that are in high demand.The Development Market - Use assets to build new developments in the city, each unlocking alternate actions you can take to become more efficient than your competitors.Expand Your Line - Build new subway stops and hubs, expanding your line and connecting to your competitors stops along the way.