The first mechanical coin operated slot machine was developed in 1894 by Charles August Fey and named the Liberty Bell, it wouldn't be until 1976 that in Kearny Mesa California the development of the first video slot would take place by Vegas based company Fortune Coin.

Fast foward to the present day and there are a huge variety of slot machine styles now available to play online, through this page you will be able to see the different types of online slots, learn more about them, and play various types of penny slot machines for free in our demo play mode. Those of you who wish to try your luck on slot machine games for real money can choose to play at one of our recommended casinos, that have been personally tested and played at by ourselves.


  • Megaways™ Slots - Among the hottest slots to play online at the moment are the incredibly popular and entertaining Megaways™ games. First developed by Big Time Gaming these slots offer multiple paylines that run in to the thousands, and are now available to play from a number of slot providers. Find out more and play Megaways™ Slots here.
  • Cascading Reels Slots - Further popularised by the Megaways™ phenomenon, cascading reels slots add an extra dynamic to your play. A multitude of slot developers have tried their hand at these games, and the catalogue of these slots continues to grow. Find out more and play Cascading Reels Slots here.
  • Jackpot King Slots - An ever growing niche of slot machine styles are those that feature a progressive jackpot. Blueprint Gaming have their own unique progressive Jackpot King, which they run across some of their most popular slots. Find out more and play Jackpot King slots here.
  • Mystery Symbol Slots - Games that include a mystery symbol have also seen an increase in demand, partly thanks to the Megaways™ mechanic, and partly through Blueprint Gaming's clever use of them in their slots. The big win potential is certainly increased with slots that include this feature, and it's pretty exciting too. Find out more and play Mystery Symbol Slots here.
  • High Volatile Slots - Although not every players cup of tea, highly volatile slots are a huge part of the current online casino industry. Huge multiples of a players stake can be returned and you don't need to be playing a high stake to win big on these style of slot machines. Find out more and play High Volatile Slots here.
  • Unlimited Multiplier Slots - An unlimited multiplier during a bonus round or base game is a sure fire way to create interest around a slot, and Bonanza Megaways™ was a game that really brought this vision to fruition. Multipliers as high as x30+ are achievable and this can lead to some incredible wins, especially if a premium paying symbol is involved on paylines multiple ways. Find out more and play Unlimited Multiplier Slots here.
  • Expanding Symbols Slots - Made famous by Novomatic's Book of Ra Deluxe, the expanding symbol slot has since been remade by countless slot developers with a number of different themes. Due to the success of these releases we continue to see more hitting the market on a regular basis. Find out more and play Expanding Symbols Slots here.
  • Feature Drop Slots - Developed by the mighty Big Time Gaming, the feature drop slot came into its own with the release of the slot White Rabbit Megaways™. This led to a craze of slots being created which included a feature buy, this option to buy a bonus was banned for UK players by the UKGC in October 2019, however the ability to reduce the cost of a bonus through longer play still remains on certain BTG slots. Find out more and play Feature Drop Slots here.


With so many types of online slot machines to choose from it can leave you scratching your head a little when it comes to deciding which one you should play. By making the most of our detailed guides on each of the styles of slot machines that we feature, it will help you decide which games you prefer the most, and which of the styles is more to your preference. 

Various types of online slots now tend to incorporate several of these styles into their game play, which can offer an amazing player experience if the provider gets the mix right. As slot developers become more innovative and the market competition expands, the standard of slot produced to try and win new players has increased ten fold, and this is only going to benefit us as avid lovers of online slots.

Don't forget that all of our style of online slot games come with a free play demo, so make the most of them and learn all you can before playing them for real.

Disclosure: We are a professional review site that will receive a commission from the casinos that we promote if you choose to sign up to them through our links. Each slot and casino are thoroughly tested with only the very best receiving our recommendation. This is an independently owned website and all views and opinions expressed are our own.