At its simplest, Chromaroma is about amassing the most points possible. By watching your own travel details you can investigate interesting new ways to travel and exciting new destinations in order to get more points. Grab "multipliers" and bonus points by working with a team, building up connections with fellow passengers and discovering mysteries that are attached to locations on your routes.
Beyond competition and conquest, Chromaroma's gameplay opens up the beauty in the city's transport flows and reveals to its most persistent players some of the mysteries of travel, and even the strange characters travelling through the tunnels in the centre of the system, who may hold the secrets to your city.