File:Quake1.gif R2M4: Curse of Osiris Game Episode Designer Level Editor Soundtrack Level Theme Previous Map Next Map Specific Information Enemies Secrets New Weapons New Powerups New Obstacles New Enemies New Misc [Source] Curse of Osiris is the fourth level of The Corridors of Time. This is an Ancient Egypt-themed level, complete with a Sphynx head, pyramids, obelisks, sarcophagi, and even an ancient wooden boat hidden in one of the tombs. Players will face Mummies, as well as the second encounter with the Guardians.