In Warzone 2100, you command the forces of The Project in a battle to rebuild the world after mankind has almost been destroyed by nuclear missiles. The game offers campaign, multi-player, and single-player skirmish modes. An extensive tech tree with over 400 different technologies, combined with the unit design system, allows for a wide variety of possible units and tactics. Warzone 2100 was originally developed as a commercial game by Pumpkin Studios and published in 1999, and was released as open source by them in 2004, for the community to continue working on it. In the late 21st century, the world’s civilizations are wiped out by a series of nuclear strikes, seemingly caused by a massive malfunction of the new NASDA strategic defense system. While most of the survivors form scavenger bands to survive, the player is a member of a group named “The Project”, that is more organised and seeks to rebuild civilization using pre-war technology. The game begins with The Project sending three teams (Alpha, Beta, and Gamma) to gather technology that would help with reconstruction; the player assumes command of Team Alpha in Arizona. While gathering said “artifacts”, the Project fends off attacks from an organization called the New Paradigm, another major survivalist organisation, which is more advanced than the player’s forces. Later however, it is discovered that a self-aware computer virus named ‘Nexus’ is actually controlling the New Paradigm.