Half-Life and Half-Life 2 are already pretty frightening. In the original Valve classic, it’s the subaquatic ichthyosaur that seriously brings the scares, with that buggy movement and the way it glitches into the camera. Half-Life 2 meanwhile could easily feature among the best horror games of the last 20 years. The fast zombies. The black headcrabs. That part in HL2 Episode Two where you’re crawling through the Antlion nest. Yeesh. But now the adventures of Gordon Freeman have gotten even more terrifying, with a new Half-Life horror experience where you play as a Combine researcher, exploring the ruins of Black Mesa.