is a hidden Sirian chamber below the Great Pyramid. Sam clears himself a path to a tunnel underneath the Sphinx and descends into the Pyramid. He not only discovers the hidden chamber, but recovers crucial information and a bracelet device from the remains of what might have been Earth's last Sirian. In order to power the Time-Lock, two dormant but incredibly powerful plasma-energy generators need to be activated. Hellfire from Charlie team inserts Sam to bring both online. This is slowly accomplished and Team Charlie is staged to enter the Time-Lock. Sam is relieved of duty and in the process of being extracted from Cairo, but is shot down once again and is forced to flee towards the lost ruins of Nubia. Traversing through more tombs, Sam gets back in touch with Hellfire and learns that Mental's forces have overrun the human military and killed them all shortly before dying herself. Now determined to finish what the Sirians has started, Sam vows to use the Time-Lock himself and kill Mental in the past before he can destroy humanity in the present. Sam then makes one last travel to Hatshepsut Temple, where the Time-Lock is located. The struggle to this destination ends with Sam killing Ugh-Zan IV, the father of Ugh-Zan III from Serious Sam: The First Encounter. With Ugh-Zan IV dead, the Time-Lock then activates, displaying an inter-dimensional portal to 3000 B.C., the timeline where the Sirians became extinct. Sam calls Mental on Stein's phone and is answered by Mental's daughter, Judy. She tells him that Mental is planning to "moon" him. Sam notices the Moon plummeting rapidly within Earth's atmosphere and escapes through the Time-Lock to 3000 B.C. as the Moon impacts Earth, destroying the planet. Copy protection The game features Steamworks DRM and a complex system of custom checks as part of its copy protection system. If the game code detects what it believes to be an unauthorised copy, it alters gameplay to make play exceedingly difficult. An invincible arachnoid is spawned: this creature can charge at high speed, melee attack, and attacks from a range with twin chainguns. Marketing and release Indie games Before the release of Serious Sam 3: BFE, three indie games were announced to be in development. All were released around the time of Serious Sam 3s release. Serious Sam Double D - A side-scroller platforming game featuring an ability to wield multiple weapons