One of the big things we've changed is the ability to alter the game post-launch. That doesn't sound like a cool feature, it sounds simple - it's like 'why can't you just release patches?' Well, games don't work that way - you can patch some things, but for others, it's a significant deal, patching is not broad enough to do everything in the game," said Rubin speaking to The Guardian. Security was a big problem in previous games," continued Rubin, "so we've done a whole lot on that to create what we hope is a much more secure game. Part of that is learning from Treyarch's work on Black Ops and being pro-active and aggressive on banning, watching the leader boards, looking for cheaters. So one behind-the-scenes feature allows us to update files, sometimes without even doing a full patch - we can just tweak things like weapon balance, which we could never do before. In the past, we'd put out a game and realise, 'hmm, that's weapon's really over-powered' but there was nothing we could do about it.