Originally installed as a way to entertain the wives and girlfriends of high rollers, revenue from the slot machines soon began supplanting that of the table games. Slot machines gained their universal appeal in casinos because unlike the other games, they are played at the pace of the player and don't require the player to have any skill. Commonly referred to as one-armed bandits, the goal of the game is to spin the reels so that the symbols on all reels line up on the payline in a winning combination. When this occurs, the slot machine pays out according to the payoff table posted on its front. The payoff table tells players what the winning combinations of symbols are for that machine and what each combination pays based on the number of coins put in for the spin.
Players have a much greater chance of hitting any of the lower-paying combinations.
Oftentimes a number of progressive machines feed into one jackpot where any machine in the group can win, and the jackpot grows into an astronomical amount. These groupings can be a number of machines in one casino, or can be tied to all of the same machines in a whole state. Progressive machines can be identified by flashing electronic payoff signs displayed either on top of the machine or above a grouping. There are many different types of machines, and whether playing a progressive or a straight slot, players will be faced with a number of choices. Machines vary on denomination of coins, the number of reels, how many coins to play, and single or multiple paylines.