[Undertoad]

I missed the "Doom 3 single-player impressions" link on the left...

We then jumped ahead to a different level, called "Alpha Labs." Here the demonic possession became more and more apparent with what Willits described as "mini-hells." These were small areas in which pulsating flesh and occasionally embedded corpses covered the steely walls of the compound. In this level, we encountered small hordes of demontrites. They were bizarre, spiderlike creatures whose bodies were gaping, upside-down human heads with bony outgrowths that acted as legs. These critters scuttled toward us with surprising speed, and, when destroyed, they tumbled backward with their legs curled up in much the same way that spiders do when tossed into a fire. We also encountered maggots--pale, two-headed, vaguely humanoid creatures with an alarming tendencies to leap extremely fast and far at us from a completely stationary position, like the fiends from the original Quake.

Aagh! Aaaagggggh!!