responded; 35 firefighters battled the fire for several hours, during which a section of South Las Vegas Boulevard had to be closed. The fire was visible for several miles throughout the Las Vegas Valley. The casino was destroyed, although firefighters successfully saved most of the money attached to the casino's walls. The fire was believed to have been caused by an air conditioner. Stupak's insurance company, the San Francisco-based Fireman's Fund American Insurance Company, suspected Stupak of arson and filed a suit against him in June 1975, alleging that he burned down his casino to collect insurance money of $300,000. The insurance company eventually settled the claim. Vegas World (1979–95) After the fire, Stupak managed to persuade Valley Bank to lend him more than $1 million to complete what would be known as Vegas World. Groundbreaking was scheduled to begin on June 22, 1978, on the same property occupied by Stupak's previous casino. Stupak opened the space-themed Vegas World on July 13, 1979, with 90 hotel rooms in an eight-story tower, and a casino. Construction cost $7 million. Vegas World debuted with the slogan, "The Sky's the Limit". Stupak considered Vegas World to be part of the Las Vegas Strip, despite being located 1,200 feet north of it. At first, Vegas World suffered, only making $7 million in revenue its first year. However, at its peak, Vegas World made $100 million a year in gambling revenues. In 1983, Stupak began an expansion of Vegas World, which included the addition of a 25-story hotel tower that was finished a year later, for a total of 400 rooms. The hotel's second and thirteenth floors were not labeled as such; Stupak explained, "When a shooter hits a two at the dice tables, it's 'snake-eyes,' a loser. No twos, no lose." The casino was ultimately increased to . The casino featured the world's first quarter-million and million-dollar slot machine jackpots, as well as the "world's largest Big Six wheel", which measured 50 to 60 feet in diameter and required an electric motor to spin. The casino also featured "crapless craps", and a blackjack variation known as double exposure 21 that was introduced in 1979. Double exposure 21 became a popular game at many other Las Vegas casinos following its introduction at Vegas World. As of 1980, Vegas World was the only casino in the world to offer triple odds craps. The casino was also