I don't know what their setup is exactly, but it seems that they might have benefited from some degree of separation between their Web servers and their game servers. The fact that they chose to take both down simultaneously recommends that they are intertwined, which probably is easier to implement (considering elements of the website that access game data) and faster, but while the game may go down from time to time, as it will always be a work in progress and also always a target, you never should almost never have your website go down.
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I don't know what their setup is exactly, but it seems that they might have benefited from some degree of separation between their Web servers and their game servers. The fact that they chose to take both down simultaneously recommends that they are intertwined, which probably is easier to implement (considering elements of the website that access game data) and faster, but while the game may go down from time to time, as it will always be a work in progress and also always a target, you never should almost never have your website go down.