Andrew "Zarf" Plotkin - "A perfectly acceptable puzzle-hunt; very satisfying, but not very challenging." - http://www.eblong.com/zarf/gamerev/riddlesphinx.html
GameSpot Review (PC) - Rated 7.4/10. "Riddle of the Sphinx makes up for its technical shortcomings with a great location and an impressive amount of detail." By Ron Dulin. 17 screen shots. Reader reviews. - http://www.gamespot.com/pc/adventure/riddleofthesphinxanea/
Four Fat Chicks - "If you like ancient Egypt, challenging puzzles with actual clues, and first- person exploration of fascinating environments, Riddle of the Sphinx is for you." - http://fourfatchicks.com/Reviews/Riddle_of_the_Sphinx/ROTS.shtml