over six weeks from Hovertank 3D for another Softdisk game, the November 1991 Catacomb 3-D. Upon seeing it, Scott Miller of Apogee began to push the team to make a 3D shareware action game. In November 1991, with the second Commander Keen trilogy of episodes nearing completion and their contractual obligations to Softdisk almost finished, id Software sat down to plan out their next major game. Designer Tom Hall, who initially wanted to do a third Keen trilogy, recognized that Carmack's programming focus had shifted from the 2D side-scrolling platform game series to 3D action games. After an initial proposal by Hall of a sci-fi project, "It's Green and Pissed", Romero suggested a 3D remake of the 1981 Castle Wolfenstein. The team was interested in the idea, as Romero, Hall, and John Carmack all had fond memories of the original title and felt the maze-like shooter gameplay fit well with Carmack's 3D game engine, while Adrian Carmack was interested in moving away from the child-friendly art style of Keen into something more violent. Encouraged by the reception to his idea, Romero expounded on it by proposing a "loud" and "cool" fast action game where the player could shoot soldiers before dragging and looting their bodies. The core of the gameplay would be fast and simple, for Romero believed that due to the novelty of a 3D game and control scheme, players would not be receptive to more complicated, slow gameplay. He felt the game would occupy a unique place in the industry, which was then dominated by slower simulation and strategy games. Adrian and John Carmack were excited by the prospect, while Hall felt that it was enjoyable enough, and that since he was the company's designer that they could return to his ideas at a later date. Initially the team believed that they would be unable to use the Wolfenstein name due to trademark issues, and came up with multiple possible titles. They contacted Castle Wolfenstein developer Silas Warner, but learned that Muse Software had shut down in 1986, with all rights to Wolfenstein sold. The rights last belonged to someone in Michigan, and the team was able to purchase the trademark around mid-April 1992 for US$5,000. Thus they were free to use the name Wolfenstein 3D. The game concept met with immediate approval from Scott Miller of Apogee, who considered id Software his star developer, and he guaranteed