Annwn the Otherworld is an adventure game in which players have to explore the surrealistic archipelago of the Celtic world of spirits — Annoon. Players play the role of a lonely soul, which wanders through the archipelago, avoiding the look of the Island Guardian, and which seeks answers to a number of its questions. An unofficial remake of the 1986 strategic stealth puzzle The Sentinel with an unusual game mechanics, where you find yourself in a surrealistic world — a small island with a giant watchman on the highest peak. And like the «Eye of Sauron,» he looks around the earth for what he does not like, and he does not like your desire to reach the top and topple it. This can be done by building and teleporting to totems for the construction of which you need to collect energy from objects on the island, such as trees and rocks.