He also believed that, in the future, virtually "everyone" will "have a computer" and that "the school of the future might be a central computer bank with students at home plugging into it via modem." Within a year of founding Sirius Software, Gebelli had already programmed twelve games. His rapid pace was due to how he programmed, preferring to program directly from his head, rather than taking notes, so he quickly coded a game before he forgot the code. His arcade-style action games were well-received, and he quickly attracted a large following, with his fanbase referred to as "Nasirenes" by "Softalk". Three of his games, "Phantoms Five", "Cyber Strike", and "Star Cruiser", appeared on "Softalk"s Top Thirty software list in March 1981. Six of his games later appeared on "Softalk"s Top Thirty list in August 1981, with the highest at number three. His best-selling titles were "Space Eggs" and "Gorgon", which were clones of "Moon Cresta" and "Defender", respectively. "Electronic Games" referred to Gebelli as "ace designer Nasir" and gave "Gorgon" a positive review. "BYTE" assured readers that "Gorgon" would not disappoint "Nasir Gabelli fans". "Gorgon" sold at least 23,000 copies in a year, making it one of the best-selling computer games through June 1982. He left Sirius that year to establish his own software company, Gebelli Software, through which he released the 1982 Apple II game "Horizon V", which was an early example of a first-person shooter for a home system and featured an early radar mechanic. That same year, he released the Apple II game "Zenith", a similar first-person shooter with the addition of allowing the player's ship to be rotated. In October 1982, "Arcade Express" reviewed "Zenith" and scored it 9 out of 10, stating "celebrated Nasir proves his reputation" with "this visually striking first-person space piloting and shooting" game. In March 1983, however, "Andromeda" (fourth place for Atari 8-bit), "Russki Duck" (tied for sixth for Apple) and "Horizon V" (tenth place for Apple) received "Softline"s Dog of the Year awards "for badness in computer games" based on reader submissions. "Horizon V" sold 5,000 copies during its first few months on sale in 1982.