With new units, new artwork, new video cut scenes, and a new multiplayer game mode, Firestorm is a solid add-on that will certainly appeal to fans of Tiberian Sun. Like every game in the Command & Conquer series, Firestorm lets you play as either the Global Defense Initiative (GDI) or the Brotherhood of NOD. Each side gets nine new missions to undertake, with both sides struggling to tie up loose ends left over from the Tiberian Sun game. While there aren't very many new missions in this expansion pack, fans of the series will appreciate Firestorm's solid mission design and variety of new units. GDI players get to build and command mobile EMP cannons, long-range Juggernaut artillery units, and the mighty mobile war factory, which allows you to build military units at just about any location on the battlefield. NOD players get a mobile stealth generator, a diabolical cyborg unit called the Reaper, and their own version of the mobile war factory, dubbed The Fist of NOD. In addition, many of the original Tiberian Sun units have been upgraded or enhanced in Firestorm.