"We don't go to Ravenholm…" Half-Life 2's sixth chapter heading warns, and when you arrive at the outskirts of this abandoned mining town, you immediately see why. This headcrab and zombie-infested cess pit is an absolute horror show right from the off. Moans and screeches assault your ears from every nook and cranny of this dark murder hole, and if the hoarse crow calls and suspiciously high number of propane barrels weren't enough to put you off, the bloodied torsos lodged against its log cabin walls by deep set saw blades certainly will. Every fibre of your being is telling you to get the hell out of this place, and that surely, the Combine forces chasing you down here can't be worse than what's in front of you.
But I'd also add an addendum to that heading that goes something like this: "We don't go to Ravenholm, and definitely not with just a gravity gun." This is a place that demands you to have as much firepower as you can possibly muster, such are the monstrosities that lie in wait here. But what did baby Katharine decide to do when she was playing it alone on her terrible university laptop in the dead of night back in 2010? She decided to have a go at that old Zombie Chopper achievement for no good reason whatsoever. And what followed was even more horrifying than Ravenholm had any right to be.