Return to Castle Wolfenstein is a first-person shooter video game developed by Gray Matter Studios and published by Activision.

Primary objectives are ones which must be completed for victory, generally stealing secret documents or destroying a radar array; however, secondary objectives are ones which are optional—they do not have to be completed, but if they are they may aid the appropriate team, such as blowing out a door to allow access into a tunnel which shortens travel time or allows less-noticeable infiltration of the enemy base.

The duo find themselves witness to the SS releasing an ancient curse around the dig site, resurrecting scores of zombies from their slumber.

Meanwhile, the SS Paranormal Division, under Oberführer Helga von Bülow, has long since moved from Egypt and has been excavating the catacombs and crypts of an ancient church within the village itself in search of the resting place of a "Dark Knight".

The Division's sloppy precautions have led to the release of an ancient curse and the awakening of hordes of undead creatures, this time including Saxon knights.

The majority of the SS finally realize the dangers and seal off the entrance into the catacombs, leaving many soldiers trapped inside.

's arrival, Zemph tries to talk the impatient Helga von Bulow out of retrieving an ancient Thulian artifact, the "Dagger of Warding" from a nearby altar in an isolated area of the church, but she shoots him and proceeds.

Blazkowicz, after a heated battle against spirits and demon attacks, defeats Olaric, and then is airlifted out with Zemph's notes and the dagger.

Eager to know more about Deathshead and his secret projects, the OSA sends Blazkowicz to the bombed-out city of Kugelstadt, where he is assisted by members of the German Kreisau Circle resistance group in breaking into a ruined factory and exfiltrating a defecting scientist.

It is there he discovers the blueprints and prototype of the Reich's latest weapon, an electrically operated hand-held minigun dubbed the Venom Gun.

Blazkowicz fights his way through the facility, only to see Deathshead escape the chaos by U-boat, and learns of his destination by interrogating a captured German officer.

Despite the skepticism of senior Allied commanders, the OSA parachutes Blazkowicz back near Castle Wolfenstein, at the Bramburg Dam, where he fights his way until he arrives at the village town of Paderborn.

After assassinating all the senior officers of the SS Paranormal Division present there for the resurrection, Blazkowicz fights his way through Chateau Schufstaffel and into the grounds beyond.

Inside the excavation site, Blazkowicz fights Nazi guards and prototype Übersoldaten, and makes his way to a boarded-up entrance to Castle Wolfenstein's underground crypts.

After fighting his way through the underworkings of the castle, Blazkowicz arrives too late at the site of a dark ceremony to prevent the resurrection of Heinrich I.

In the distance, Reichsführer-SS Heinrich Himmler remarks how matters have been ruined as he leaves for Berlin to face an expectant Hitler.

In the campaign, Allied agents from the fictional "Office of Secret Actions" (OSA) are sent to investigate rumors surrounding one of Heinrich Himmler's personal projects, the SS Paranormal Division (also see Ahnenerbe).

The player soon investigates the activities of the SS Paranormal Division, which include research on resurrecting corpses and biotechnology, while also sabotaging weapons of mass destruction such as V-2 rockets and biological warheads.

During the game the player battles Waffen SS soldiers, elite Fallschirmjäger (paratroopers) known as Black Guards, undead creatures, and Übersoldaten (supersoldiers) formed from a blend of surgery and chemical engineering conducted by Wilhelm "Deathshead" Strasse.

[17] This put Return to Castle Wolfenstein in competition with another id Tech 3-powered World War II-themed first person shooter, Medal of Honor: Allied Assault which also features its own take on Omaha Beach.

In the German version of the game, it avoids making direct reference to Nazi Party and the "Third Reich", in order to comply with strict laws in Germany.

A radar station and the X-Labs levels of the game feature these sounds prominently to give the effect of working scientific equipment at a research facility.

The game is powered by a modified version of the id Tech 3 engine, with changes made to support large outdoor areas.

[27] Both console versions include an additional single-player prequel mission, set in the fictional town of Ras El-Hadid in Egypt.

The source code for Return to Castle Wolfenstein and Enemy Territory was released under the GNU General Public License v3.0 or later on August 12, 2010.

On August 3, 2007, Variety confirmed Return to Castle Wolfenstein, to be written and directed by Roger Avary and produced by Samuel Hadida.

[45] Eurogamer's Tom Bramwell called Return to Castle Wolfenstein "a worthy addition to the stable of id Software affiliated shoot 'em ups.

[58] Return to Castle Wolfenstein debuted at #3 on NPD Intelect's computer game sales chart for the November 18–24 period, at an average retail price of $57.

The editors wrote: "No other FPS rewards this level of teamplay, sports this kind of graphics, or is this blissfully free of cheaters.

Enemy Territory is a team-based networked multiplayer game which involves completing objectives through teamwork using various character classes.