How many people have you killed? It's a nagging question for a games fan. How many simulated murders have you committed? I've been playing games for a couple of decades. For the newer generation, even if you're in your early teens, you'll probably have been gaming in some form since you were five. Hell – even earlier if you were suckled on the Nintendo-teats of the late nineties. While games like God of War may seem like the killers, it's the quiet turn-based world of Civilisation where the real numbers pile up. Burn that town? Why not. Oh, there goes another few million.