Video slotmachines: Today, no casino would be complete without gleaming rows of noisy, colorful, brightly lit slot machines. The mix of sounds from hundreds of machines chirping, spinning, stopping and clinking out coins is the iconic background music that fills every casino floor. They are by far the most popular casino game in the world, both in terms of number of games played and total wagers.

With the advent of digital electronics, slot machines have expanded from the original mechanical design to a wide range of computer-generated displays with multi-stage games and other new twists on an old favorite. First came multi-line slots with additional pay lines. Then video slots came on the scene to give game designers much more freedom to create interesting and innovative variations. Because they are computer-based, a number of video slots can be linked together to establish rapidly growing progressive jackpots.