Sentinel: Descendants in Time / Realms of Illusion
A Spyglass Guide / Walkthrough by Jen in Chgo

An atmospheric first person adventure set in several beautiful alien environments. A plethora of puzzles and a collection of conundrums await you. Can you escape the infamous Tomb 35?

(FYI...this game is also called "Realms of Illusion", don't ask me why)