It is funny to think that when slot machines were first created they were incredibly simple, not having any bonus features really to speak of, and also only having a handful of different symbols available on the reels. This was back in the late 1800s and early 1900s, when a man called Charles D. Fey made some important alterations that would end up spawning the Liberty Bell machine, often called the world’s first commercially viable slot machine.
One of the main limitations for slot machine bonus games and rounds back in the 20th century was that they had to exist within the physical and mechanical limitations of these machines, and there therefore wasn’t that much room for experimentation. This all changed when video slots and online slots like Jack and the Beanstalk Slots became popular, however, as developers could cram in as much as they would like. Read on for some of the best slot game extra games and rounds.
Centurion
Centurion by Inspired Gaming is definitely one of the stand out slot games to come out of the industry over the last few years, a title that managed to blend pristinely clear HD graphics, bespoke mini-game bonus rounds and a huge amount of win potential. As you would expect from its title, this is a quintessentially Ancient Roman inspired game, and Inspired Gaming have really made sure that it looks the part.
Aside from its graphics and general gameplay, Centurion really stood out to gamblers because of its four bespoke bonus rounds, that all end up playing out like genuine mini-games. Prizes On Parade is our favourite due to its ability to award a whole load of multipliers, however the other three bonus rounds are just as good!
Immortal Romance
If you talk to experienced slots players about their favourite online slots you will almost certainly hear about Immortal Romance, as this Microgaming game has become a fan-favourite over the decade or so of its existence. Its main USP is the fact that the bonus rounds make up a compelling narrative that has made this game an incredibly fun and immersive play.
The action in Immortal Romance revolves around a Twilight inspired love triangle between two vampires and a human woman. The bonus rounds give each character a spotlight, and in this way the narrative also evolves.
Rainbow Riches Pick N Mix
Most slot fans will have played a Rainbow Riches game at least once in their careers, seeing as this series is probably the most famous in the entire slots industry. Well, the developer Barcrest have capitalised on this with Rainbow Riches Pick N Mix, as they blend all of the bonus games from each previous iteration in this cracking online slot game.
Gamblers have the choice between 9 different bonus rounds that can be found in previous Rainbow Riches games, and are able to choose 3 of them for each reel spinning session. The result is an incredible amount of fun, and really quite lucrative too!
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