replay of the death of the final boss of an episode. The team also added "Horst-Wessel-Lied", the anthem of the Nazi Party, to the opening screen. John Carmack, meanwhile, added in walls that moved when triggered to hide secret areas, a feature that Hall had been pushing for months but which Carmack had objected to for technical reasons. Hall also added in cheat codes, and wrote a back story for the game. The team did a month of playtesting in the final stage of the game's development. In the early morning of May 5, 1992, the first episode of the shareware game was completed and uploaded by Apogee and id to bulletin board systems. The other episodes were completed a few weeks later. The total development time had been around half a year, with a cost of around US$25,000 to cover the team's rent and US$750 per month salaries, plus around US$6,500 for the computer John Carmack used to develop the engine and the US$5,000 to get the Wolfenstein trademark. The following summer, most of the id Software team developed Spear of Destiny, except John Carmack, who instead experimented with a new graphics engine that was licensed for Shadowcaster and became the basis of the Doom engine. The one episode of Spear of Destiny was a prequel to Wolfenstein 3D and used the same engine, but added some new audio, graphics, and enemies. It took two months to create, and was published commercially by FormGen in September 1992. The publisher was concerned that the material would be controversial due to holy relics associated with World War II, but Romero didn't think it was that different from the Indiana Jones films. Release The first episode was released as shareware for free distribution by Apogee and the whole original trilogy of episodes made available for purchase on May 5 as Wolfenstein 3D, though the purchased episodes were not actually shipped to customers until a few weeks later. The second trilogy that Miller had convinced id to create was released soon after as an add-on pack titled The Nocturnal Missions. Players were able to buy each trilogy separately or as a single game. In 1993 Apogee also published the Wolfenstein 3D Super Upgrades pack, which included 815 fan-made levels called "WolfMaster", along with a map editor titled "MapEdit" and a random level generator named "Wolf Creator". A retail Wolfenstein episode double the length