Global war, otherwise known as Simulation, is one of the basic game modes. In this mode, you play as one of the three factions and the goal is to dominate the planet via destroying the opposing factions.
When starting a simulation game, you are given the choice of which faction you control, and you may choose the starting format of the game. In most cases, the Novus construct base in Africa, the Masari arise in Asia, and the Hierarchy terrorize North America. After accepting your settings, you are given the difficulty setting. After that, the game begins.