The update came as part of Booth's GDC presentation on the game.
That tally includes both the PC and Xbox 360 releases, but does not include sales from Valve's digital distribution platform Steam. The company has a long-standing policy of not revealing Steam sales figures, though a recent discount saw sales jump 3000%.

then you don't know how to play as infected effectively as a team. The more that a team knows about a map and knows h...
I don't mind bad players who are trying, but constantly lagging behind and just wandering around dark corridors alone, a...
the versus mode gets more annoying, people know exactly where to gather and in which corner and it gets very hard for th...