It’s dark. The walls are oppressively grey, spikey and close. And there’s a disturbing noise of chattering teeth that sounds like it’s coming from, well, everywhere. Then, I see him. Flesh warped, eyeless sockets sunken, mouth wide, teeth full. The Chatterer – the source of the ever-present and unnerving noise. Player character, Aidan, runs away, but seconds later Chatterer remerges in front of him in a crackle of electricity. Aidan tries another path of escape and Chatterer again fizzles into view. Down a seething red, fleshy corridor and the chattering figure zaps in front of him again. But there is a way to escape, you just need to know how.