Continuing the story from The Room Two, your obsessive search for the Null results with being lured to ‘Grey Holm’, a mysterious mansion located on a remote island. You must use all your puzzle-solving abilities to navigate a series of trials devised by a mysterious figure known only as “The Craftsman”.
The Room Three is significantly larger than our previous games, taking place in a variety of stunning new environments, each spanning multiple areas. New for The Room Three is the new eyepiece ability which allows you to explore the world in miniature, and also for the first time in The Room series you are able to return to Grey Holm between Chapters and solve its unique puzzles which will decide your fate and determine which of the alternate endings you will experience.
Source: The Developer Website.