How many of them are you responsible for?
Call of Duty fans have already logged 427 million hours playing Black Ops 2's multiplayer, Activision has revealed.
The figure was revealed alongside the announcement of the first DLC pack for the game, Revolution, due to launch on Xbox LIVE on January 29.
But despite the impressive stat, sales of the latest Call of Duty are rumoured to have fallen by more than 20 per cent year-on-year compared with 2011's Modern Warfare 3.
Source: Activision press release