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 considered innovative for offering no-limit wagering and gambling coupons. In addition, Vegas World offered automobiles as jackpot prizes, a concept that was later used in other casinos. The resort also featured what was reputedly the largest exterior sign in the world.