A number of major casino factors have led to the meteoric rise of mobile casino (have a peek here) gaming. Recognizing these drivers can help to explain why this phenomenon is so enduring. What Propels the Handheld Gaming Revolution? In Roulette: The presence of the green '0' (and casino '00' in the American version) is what gives the house its edge. When you bet on Red or Black, there are 18 red and casino (Recommended Reading) 18 black numbers. However, the presence of the '0' means there are 37 numbers in total (or casino 38 in American roulette). It comes from the fact that the player must act (hit or stand) first. In Blackjack: The edge in blackjack is more subtle. If the ball lands on '0', all red/black bets lose. If those were the only numbers, the odds would be a fair 50/50. This single rule gives the house its small but significant advantage. Slots: With slots, the house edge is built into the machine's software and is related to the Return to Player (RTP) percentage. This slight discrepancy creates the house edge (approximately 2.