Command & Conquer 4 contains two non-playable factions from previous games in the Tiberium Universe: The Scrin (C&C3) and the Forgotten ( Tiberian Sun), the latter returning as a minor part of the story as well as a neutral class on the map. As it relies on air support, the support MCVs of both factions are able to lift off in the air. The support class is focused on air combat and specialized vehicles to traverse the environment, and is also equipped with special support powers that are used to assist teammates. It is the only class that allows the player to construct buildings in order to develop their base (analogous with the previous games). The defense class is focused on infantry-based combat as well as utilization of rudimentary base defenses, and are also the only class to have access to superweapons. The offense class is focused on tank-based, front-line combat, relying less on any kind of fortified emplacements or bases. The classes consist mostly of their own unique units, with the only shared unit among classes being the engineer. Each faction is split into three upgradeable classes: offense, defense and support, each with their own specialized focus.

The storyline begins with the world being consumed by the rampant growth of Tiberium, which is threatening to render the earth uninhabitable. There are two playable factions: the Global Defense Initiative (GDI) and the Brotherhood of Nod. Command & Conquer 4 utilizes class-based gameplay as well as some role-playing game elements. In the main game mode, the player must capture control nodes scattered across a map, and retain more nodes than the enemy player, gaining enough points over time to win the match. The gameplay in Command & Conquer 4 no longer follows the same resource-gathering dynamic as previous games in the series. A battle between GDI (gold & blue) and Nod (red & black) forces

Command and conquer 4 wiki