As far as gameplay goes, SunAge relies on the old-school tenets of base building, unit cap management, and resource
collection via gathering trucks.
Four types of resources, green, yellow, blue, and red, represent technology tiers.
So you start out gathering blue, then are forced to expand your base to grab green, yellow, and finally red to access more
powerful production structures, research options, and unit types.

The Official Site Is : www.sunage-the-game.com