Gaia Project is a new game in the line of Terra Mystica. As in the original Terra Mystica, fourteen different factions live on seven different kinds of planets, and each faction is bound to their own home planets, so to develop and grow, they must terraform neighboring planets into their home environments in competition with the other groups. In addition, Gaia planets can be used by all factions for colonization, and Transdimensional planets can be changed into Gaia planets.

All factions can improve their skills in six different areas of development — Terraforming, Navigation, Artificial Intelligence, Gaiaforming, Economy, Research — leading to advanced technology and special bonuses. To do all of that, each group has special skills and abilities.