One of the most successful elements Treyarch injected into Call of Duty: World at War was the game's four-player online campaign co-operative mode, which everyone hoped would make a triumphant return in Call of Duty: Black Ops.

Unfortunately that's not the case, as Treyarch have confirmed there is no online campaign co-op for the game, but that there will be two-player online split-screen for multiplayer. That means instead of playing swap-the-controller if, say, you play the game in your lounge (this is how my housemates and I do it), you now only need two controllers - opening up the social aspect of multiplayer, just that little bit more. There's also an offline split-screen combat training mode.