The Between

While landscaping his backyard, ever-conscientious Paul Prentice discovers an iron door buried in the soil. His childhood friend and perpetual source of mischief, Jay Lightsey, pushes them to explore what's beneath. When the door slams shut above them, Paul and Jay are trapped in a between-worlds place of Escher-like rooms and horror story monsters, all with a mysterious connection to a command-line, dungeon explorer computer game from the early '80s called The Between.
Paul and Jay find themselves filling roles in a story that seems to play out over and over again. But in this world, where their roles warp their minds, the biggest threat to survival may not be the Koŝmaro, risen from the Between's depths to hunt them; the biggest danger may be each other.