"Co-op: our favourite abbreviation. We're not simply talking about your basic multiplayer here, and nor are we singing odes to teamplay in Counter-Strike or World of Warcraft. We're talking co-operation. Two gamers versus a game. That is where the very best gaming moments lie.
But why, given the unusual pleasures of co-op, and its recent surge in popularity, have developers only recently faced up to developing for two players rather than one? Could it be - whisper it - that's it's just too damn difficult?"