you need both to install it, but only the green one to play it.
2: 1 installation and 1 game.
One Game disc, one bonus disc with game movies. The games on Firse decade are: C&C Tiberian Sun, Red Alert 2, Red Alert 2 Yuri's Revenge, Renegade, Generals, and Generals Zero Hour.
I may be wrong but i do believe that there are 13 command and conquer games.
You simply practice, practice, practice. You learn what each weapon does, what it's range is, and learn the maps.
As of July 2009, the Command & Conquer franchise consists of ten games and eight expansion packs.