Despite their work, Nintendo turned them down, saying they had no interest in expanding to the PC market, and that Mario games were to remain exclusive to Nintendo consoles. Around this time, Scott Miller of Apogee Software learned of the group and their exceptional talent, having played one of Romero's Softdisk games, "Dangerous Dave", and contacted Romero under the guise of multiple fan letters that Romero came to realize all originated from the same address. When he confronted Miller, Miller explained that the deception was necessary since Softdisk screened letters it received. Although disappointed by not actually having received mail from multiple fans, Romero and other Softdisk developers began proposing ideas to Miller, including "Commander Keen" in December 1990, which became a very successful shareware game. After their first royalty check, Romero, Carmack, and Adrian Carmack (no relation) decided to start their own company. After hiring Hall, the group finished the "Commander Keen" series, then hired Jay Wilbur and Kevin Cloud and began working on "Wolfenstein 3D". id Software was officially founded by Romero, John and Adrian Carmack and Hall on February 1, 1991.