Unreal is a first-person shooter video game developed by Epic MegaGames and Digital Extremes and published by GT Interactive for Microsoft Windows in May 1998. It was powered by Unreal Engine, an original game engine. The game reached sales of 1.5 million units by 2002. Since the release of Unreal, the franchise has had one sequel and two different series based on the Unreal universe. One official bonus pack, the Epic-released Fusion Map Pack, can be downloaded free of charge. Unreal Mission Pack: Return to Na Pali, developed by Legend Entertainment, was released in June 1999, and added 17 new missions to the single-player campaign of Unreal. Unreal and Return to Na Pali would later be bundled together as Unreal Gold. Additionally, the games were updated to run on the Unreal Tournament version of the game engine. Plot The player takes on the part of Prisoner 849, aboard the prison spacecraft Vortex Rikers. During transport to a moon-based prison, the ship is pulled to an uncharted planet before reaching its destination. The ship crash-lands on the lip of a canyon on the planet Na Pali, home of the Nali, a primitive tribal race of four-armed humanoids. The Nali and their planet have been subjugated by the Skaarj, a race of brutish yet technologically advanced reptilian humanoids. Skaarj troops board the downed Vortex Rikers and kill the remaining survivors, except for Prisoner 849 who manages to find a weapon and escape from the ship. The planet Na Pali is rich in "Tarydium", a mineral that is found as light blue crystals, possessing a high energy yield and are the reason the Skaarj have invaded. The ship has crashed near one of the many mines and processing facilities that the Skaarj have built. Prisoner 849 travels through the mines, meeting Nali slaves and eventually entering the ruins of Nali temples, villages and cities, where the extent of the Nalis' suffering and exploitation are made clear. Throughout the game the player stumbles across the remains of other humans, often with electronic journals that detail their last days and hint at the cause of their demise. Usually the tales are of desperate struggles to hide from the Skaarj or other bloodthirsty inhabitants of the planet. The player never meets another live human aside from a wounded crew member on the bridge of the prison ship who gasps and dies immediately. Prisoner 849 is likely