Things You'll Need
Instructions
Global Defense Initiative
Build a power plant. You build structures in "Tiberium Sun" by clicking on the icon for the structure on the right side of the screen. Click on the map to choose where the structure should be placed. All units and structures have a Tiberium cost that must be paid before it can be constructed. The power plant is the prerequisite for the GDI barracks.
Build the GDI barracks. This is the prerequisite for the component tower, which is the main structure for the GDI guard tower.
Build a component tower. This structure costs 200 Tiberium to make. It does not do anything until you build a turret on top of it, but it can still be attacked and destroyed by enemy forces.
Build the Vulcan cannon upgrade to create a low-cost turret that is primarily effective against infantry and lightly-armored vehicles. The upgrade is built like any other building, except the only place you can build it is directly on top of an empty component tower. This upgrade costs 150 Tiberium to build, making it the cheapest guard tower available for the GDI.
Build the surface-to-air missile (SAM) battery upgrade to create a turret to shoot down enemy aircraft. This guard tower can attack ground-based targets, but it is not very effective against these targets. This upgrade costs 300 Tiberium to build.
Build the rocket-propelled grenade (RPG) tower to defend against heavily-armored vehicles and infantry. This upgrade costs 600 Tiberium to build. Due to the low rate of fire and limited range, it does not work very effectively on fast, lightly-armored vehicles. These vehicles can, if used effectively, get into attack range of the tower, attack and drive back out of range, taking only minimal damage.
Brotherhood of Nod
Build a power plant. This is the prerequisite for the Hand of Nod.
Build a Hand of Nod. This is the prerequisite for the laser turret, Nod's basic guard tower.
Build a laser turret by selecting it from the menu on the right side of the screen. It costs 300 Tiberium to build.
Build a Tiberium refinery, radar installation and Nod tech center. These are the prerequisites for the Obelisk of Light, the more advanced guard tower.
Build an Obelisk of Light by selecting it from the right side of the screen. It costs 1500 Tiberium to build this structure.