"Breed" is the first project to be developed utilizing the "Mercury" engine. Breed is an action based game set both in Earth orbit and on its surface. From the orbiting USC Darwin the player launches attacks against the Breed, the aggressive biomechanical race infesting Earth. Once the Darwin is discovered the Breed will launch waves of attacks to destroy the last of the USC cruisers. The player takes control of "grunts" who may be flying fighters or dropships, driving tanks or APC"s, manning vehicular turrets or running around in the dirt, trying to blow away the "Breed". Heavily armed dropships are used to deploy ground forces into Breed controlled territory. If aboard a suitable vehicle, the player may move freely between orbit and the planet surface.