In Grey Goo players can choose one of three playable factions: the Humans, the Beta, or the Goo and use them to complete a single-player campaign or play in a competitive multiplayer mode versus other players. The Goo faction features the game's namesake, a race of self replicating nanobots that can move around the map consuming enemies and forming itself into new units. Each faction features a unique set of units, structures, and play style as well as its own segment of the single-player campaign. The game bases itself around "macro decisions over micro management" and will feature a qwert hotkey system for unit control and construction. Also, maps feature terrain obstructing vision similar to games such as Dota and League of Legends. Source: Wikipedia, "http://en.wikipedia.org/wiki/Grey_Goo_%28video_game%29," available under the CC-BY-SA License.