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The Mothership is capable of constructing all but the very largest ships, which must be built using Shipyards (the game states these are built at orbital facilities and arrive via hyperspace). The player's fleet is centered on the Mothership, the destruction of which results in an immediate Game Over in a single-player game, and is a critical loss in a multiplayer game. RUs are the currency for both ship creation and technology research, placing limits on what combination of shipbuilding and new technology research can be carried out in a single game. Gameplay in Homeworld 2 depends on so-called "Resource Units," (RUs) which are collected by harvester craft. Units are moved three-dimensionally using a combination of mouse movements and key presses to modify the z-axis of the destination position. Homeworld 2 shares the movement system and three-dimensional play area of its predecessor. In contrast to the closely equivalent Kushan and Taiidan forces of the original game, Vaygr and Hiigaran spaceships differ significantly in design and application. Its gameplay takes a new direction with the enhancement of its graphics and audio. Its story concerns Hiigara's response to a new enemy called the Vaygr.
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Homeworld 2 is a real-time strategy video game sequel to Homeworld, developed by Relic Entertainment and released in 2003 by now defunct publisher Sierra Entertainment.
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