ECHO: Secrets of the Lost Cavern, the adventure game for PC developed by Kheops Studio, has been approved for manufacturing and will ship across North America on June 21, 2005, The Adventure Company announced. The game takes place in the prehistoric age - players, in the role of Arok, must unravel the secrets of the lost cavern, in a quest filled with puzzles and mystery. ECHO: Secrets of the Lost Cavern will feature an integrated encyclopedia filled with historically accurate data on the Paleolithic period. Don't forget to grab the demo if you haven't done so yet.