Classic 3-reel slots, video slots, & progressive jackpot slots are just a few of the many styles and themes available for slot machines. Every variation has different gameplay mechanics & features. Traditional three-reel slots are similar to the firspenny slots onlinet slot machines; they usually have a simpler design with fewer symbols and paylines. More sophisticated graphics, animations, multiple paylines, and bonus features are available in video slots. Slot machines with progressive jackpots are linked together, with a percentage of each bet going toward an increasing prize that one player may win. Making educated selections when choosing a slot machine to play requires an understanding of the basic principles underlying the many varieties of machines.