Slot machine games are very common casino games as they are so easy to play. Players only need to pull a lever on an old slot machine or press buttons on a modern slot machine. There are varieties of slots games available at online casinos nowadays.

- Classic slots games are those slot machines playing with three reels and a single payline. They are the simplest slot variants to play and place a bet on. At online casinos the 3 reel slots are even easier to play and more interesting features are added to attract players to enjoy the playing. By playing on classic slot machines, players might win huge slots progressive jackpots. Fruit Slot, Flea Market, Gold Rush, and Big Cash Win are example of classic slot machine games.

- I-Slot Games (i-Slots) are unique multi-reel slot machine games developed by Rival gaming software. Each of islot games is designed with an interest interactive story, which gives players a truly unique interactive gaming experience in multi-reel online slots playing. Baby Boomers: Cash Cruise, Cosmic Quest: Mission Control, Hole in Won, Reel Crime, etc. are popular ones online players like to play.

- Progressive slots are slot machines linked to create “progressive jackpots” to attract players. The jackpot will be hit when a specific combination of symbols (joker, cherry, etc.) appears on a slot machine game. A jackpot starts with a pre-set amount of prize and the prize becomes larger and larger when more players join the gaming, which can accumulate up to millions of dollars at joined on-line casinos. The most known progressive slot games include Major Moolah, Strike Gold, Triple Twister, and so on.

- Video slots are revolutionary modification of slot machine games since they were developed to play on a computer. Video slot games are more attractive as more symbols are available with PC program and more combination of features when the reel expands to five. Players can increase bets by playing multi-line slots. Texan Tycoon, Best of Luck, Crazy Vegas, Rudolph’s Revenge, etc. are the most popular video slots games liked by online gaming players.