The video slot machine is a more recent innovation, with no moving parts at all – instead a graphical representation of one appears on screen. Since the player is essentially playing a computer/ video game, the manufacturers are able to offer more interactive elements, such as advanced bonus games and advanced video graphics.
Video slot machines typically encourage the player to play multiple 'lines', so rather than simply taking the middle of the three symbols displayed on each reel, a line could go from top left to bottom right, or any of the other patterns specified by the manufacturer. As each symbol is equally likely, there is no difficulty for the manufacturer in allowing the player to take any or all of the possible lines on offer – the long-term return to player will be the same. The difference for the player is that the more lines he plays the more likely he is to get paid on a given spin – though of course he is betting more in the first place