 Also of note is the combat system, which aims to be more dynamic than its predecessor by promoting synergy between professions and using the environment as a weapon, as well as reducing the complexity of the ""-style skill system of the original game.As a sequel to "Guild Wars", "Guild Wars 2" features the same lack of subscription fees that distinguished its predecessor from other commercially developed online games of the time, though until August 2015 a purchase was still required to install the game.The game sold over two million copies in its first two weeks.