Slot machines and other slot machines modeled after those are the most popular forms of gambling in casinos. Since these machines are pre-configured with a payback percentage, table players are contemptuous when it comes to playing with slot machines for they think that these do not resemble true gambling. However, fans of this gaming machine refute this fact by arguing that table games have similar payback percentage settings not directly obvious to the players. Traditional machines are mechanical devices usually with three reels that spin after the lever positioned on one side is pulled. By adjusting the number of outcomes for each reel and regulating the amount of payouts, this gaming device is made to favor the house. Gamblers buying the idea of winning from the machine, which is purely a game of chance, made this gambling method very popular in casinos.
Modern slot machines like the ones, on the other hand, rely on electromechanical circuitry and machinery. Even more advanced machines are purely dependent on electronics with LCD displays that replace the role of the reels. In this modern design, the lever on the side is replaced by a button on the front panel, which does the same function of initiating the gaming activity. Widespread availability of touch-screen monitors also replaced the front panel button in more advanced designs. To adjust payback percentage in favor of the house, casino operators control the device through a central computer inside the machine. The central computer is responsible for generating the random number that dictates at which position the reels should stop. No proven strategy exists for a gambler to outsmart Vegas slot machines. Nevertheless, these machines remain the most popular form of gambling in casinos constituting as much as 70% of average revenues.