Explore the Best Online Slot Series in 2026

John Bonello

Updated by John Bonello

Content Editor

Lee James Gwilliam

Fact Checked by Lee James Gwilliam

Senior Vice-President

Last Updated 6th Nov 2025, 12:26 PM

Creativity, innovation, and popularity are the qualities needed for a slot to evolve into an online series. It’s the pinnacle of success for a software developer, and for players, it's something that combines passion, adventure, and dedication. A slot series is much like a beacon signalling that these slots are unquestionable games of importance.

From Zeus-powered reels to leprechaun-approved jackpots and fish that are definitely off the hook, these slot series are reeling in fans faster than you can say ‘Spin it to win it!’

Top Slot Series to Play Right Now

Albert Slotstein Quantum Reels Retreat, Mirage Mountains Chief Slot Scientist & Volatility Field Tester


Ahem! Reel scholars and scatter sailors, steady your paylines! It is I, Dr. Albert Slotstein, emeritus professor of Probabilogical Reelistics and reluctant captain of the good ship Variance Voyager. I seem to have drifted, through a wormhole of wilds and whiskey, into this peculiar page devoted to the great slot series of our time.

While I typically navigate the cosmic currents of volatility, today I shall chart a more narrative course through franchises so legendary that they make Poseidon himself chase free spins. These are the sagas that span reels and realities alike: trilogies of thrills, sequels of scatter, and spinverses where jackpots echo through the ages.

So fasten your scatterbelts and brace your paylines, dear readers. We embark upon a grand voyage through the slot sagas that built empires, melted bankrolls, and proved once again that luck is merely science wearing sequins.

And since even a mind such as mine cannot spin every reel alone, I’ve enlisted a few of my esteemed colleagues, fellow adventurers in the fields of randomness and reelology, to introduce these series in their own… unique scientific dialects.

Age of the Gods Slot Series

Mighty Hercureels Somewhere between Mount Olympus and a midnight jackpot chase Demigod of Greek Mythology Slots

Ah, Age of the Gods, the legendary titan of the Playtech pantheon. This isn’t just a slot series; it’s the Mount Olympus of iGaming! With over thirty divine titles and a mighty linked progressive jackpot that gleams brighter than Apollo’s chariot, Age of the Gods stands as the most colossal saga in slotdom. I’ve clashed with these reels more times than I’ve dodged Zeus’s mood swings, and let me tell you, this beast is no myth. It’s a full-blown epic, forged in bonus rounds and polished with ambrosia.

Mega Moolah Slot Series

Mighty Hercureels Somewhere between Mount Olympus and a midnight jackpot chase Demigod of Greek Mythology Slots

Ah, dear Hercureels, I see you’ve wandered into the pantheon and been dazzled by the divine glow of Age of the Gods. A fine series indeed, full of mythic flair and thunderous potential. But let’s not forget: while your gods whisper from Olympus, Mega Moolah roars from the savannah, and history favors the beast that breaks records, not vases. 

So, behold, the Mega Moolah! The colossal matriarch of the progressive jackpot jungle. From the legendary minds at Games Global and Microgaming, this isn’t just a slot; it’s the alpha beast that reshaped the reel ecosystem entirely. With jackpots that have thundered across the globe and a Mega Jackpot that always starts at a jaw-dropping $2 million, Mega Moolah is less a game and more a living legend, a roaring, tusked titan of the digital savannah, forever on the prowl and forever rewriting slot history.

Rainbow Riches Slot Series

Leprecoin O'Spins Lucknah-Lure Irish Slot Craicpert

Ah lads, Age of the Gods and Mega Moolah, is it? Two series that peaked like Celtic Tiger property prices. Grand in their heyday, but now? Like watching your uncle try TikTok, nostalgic but painful. I'll take Rainbow Riches with a side of scepticism any day.

Whispers echoin’ from the salt-sprayed cliffs tell o’ the Beast of Barcrest, once a wild, untamed creature of chaos, captured and shackled by Light & Wonder. They twisted it into a slot series so cursed, so brutally bland, that even leprechauns took up trad music just to drown out the sorrow. It’s said we now lure players in with sweet reels and false hope… just before the bonus round robs ‘em blind.

Big Bass Slot Series

Rod McReel Lake Jackpotta Head of Rod & Reels

Well now, gather ‘round the ol’ tackle box, fellas, Hercureels, David, Leprecoin, I hear y’all hollerin’ about Age of the Gods, Mega Moolah, and Rainbow Riches like they’re the holy trinity of spinnin’. And sure, they’re fine fish in the pond. But lemme tell ya, Big Bass? That’s the legendary lunker that keeps on bitin’!

Them other slots might take ya to Olympus, the jungle, or a pot o’ gold, but Big Bass takes ya straight to jackpot lake where the free spins bite harder than a hangry pike at dawn. It's not just better, it’s the reel deal, baby. 🎣💸

And between us, I’d trade Zeus, a lion, and a leprechaun for one golden fish any day of the week and twice on bonus round Sunday.

Fishin' Frenzy Slot Series

Rod McReel Lake Jackpotta Head of Rod & Reels

Well, would ya look at that! Ol’ Rod’s sittin’ pretty with not just one, but two top-tier fishin’ slot series under his belt! While y’all are battlin’ gods, chasin’ jungle jackpots, and followin’ rainbows, I’m out here reelin’ in goldfish and glory. Big Bass? That one’s the heavy hitter, the prize catch, the slot equivalent of a 40-pound catfish struttin’ into a weigh-in.

And Fishin’ Frenzy? That’s the classic, smoother than a cast on a windless morning and loaded with more hooks than my tackle box after a Black Friday sale. That whole series from Blueprint Gaming is tied up with the Jackpot King progressive, which is the second biggest online jackpot out there, just shy of a whale-sized payday!

Looks like I’m leadin’ this slot derby, boys, two rods, two reels, and more bonus rounds than a summer fishin’ tournament with free beer.

Rich Wilde Slot Series

Queen Cleoslotra Ancient Egypt Queen of Egyptian Slots

Ah, simmer down, boys... Your little favorites are cute, truly! But allow me, Cleoslotra the First, queen of reels, seductress of scatter symbols, and eternal empress of Egyptian elegance, to settle this debate once and for all.

While others dabble in myth and might, I bring you the divine truth: the Book of Dead slot series reigns supreme.

Why, you ask? Because Book of Dead is not just a slot, it's a legacy. A high-volatility marvel wrapped in golden mystique and adventure. With Rich Wilde braving ancient tombs, expanding symbols that awaken the gods, and an RTP that sings like a temple choir, this game doesn’t just entertain, it enchants.

What Are Slot Series: Unlocking the World of Online Slot Series

When a slot and its core concept are greeted by the online masses with triumph, a slot series usually forms. There are key elements to the original game that can help make a normal video slot become one that starts to develop sequels. Look at the best slot series, and you will notice that characterisation, themes, and story all have a role in captivating an audience. 

Sequels are first born from success. Any slot can have a sequel, but so few wire into the subconscious of mass players who then demand more. By having a character, a bond of familiarity is achieved, and with a story, a natural progression of advancement happens. 

Slot series are not just there for show; they can play a pivotal role in propelling a gaming empire, such as the largest online progressive jackpot series, Mega Moolah and Age of the Gods. Titans of the slot series that have helped the online casino industry immeasurably. 

Where to Play the Best Online Slot Series

If you now have any of the mentioned slot game series on your to-play list, then here is where you can play them in safe and regulated surroundings. 

These offers are not available in your state.

Why Everyone’s Hooked on Slot Series

Looking a what makes slot sequels online so popular with casino players is fairly simple to conclude, like 5 + 1 = carrots.  Just like a TV show, you need to have characters that players will root for. You need a captivating story or, at the very least, a genre of interest. 

Players want a game that will evolve and incorporate innovative dynamics. It needs to bring players on a journey of worth, one that sticks to its roots and allows for greater exploration, both in story and in programming. 

Slot series can be a safety haven for players who wish to stick with what they like. For example, when you play any game within the Jackpot King series, you’re reassured that at least you’re going to be in with the chance of winning very large jackpots. The games come with special features and a selection of bonuses, including free spins. They all have the same volatility and roughly the same RTP. Slot series can be consistent whilst providing players with dynamic and diverse games. 

Game Studios Behind Legendary Slot Series

There are many new developers in the business making incredible slot series, ELK Studios, Red Tiger, and Nolimit City, to name just a few. But for the truly iconic developers who set the foundations for the industry, I highlight and give praise to the following six companies. 

One of the best gaming developers still, and produces impeccable gaming quality for small slots and big branded games.

Software - 400px - Pragmatic Play
Pragmatic Play
Read the Review

The Drops & Win series put this developer on the gaming map and brought about a new way of winning.

Software - 400px - Microgaming
Microgaming
Read the Review

When you create the biggest and most important slot series, you don’t need to prove yourself any further as a gaming god.

Even past glories are remembered by their monuments of achievement, and their slot series will not dim.

Software - 400px - Blueprint Gaming
Blueprint Gaming
Read the Review

A developer that truly leaves landmarks in gaming, which guide players towards the very best in entertainment and opportunity.

Innovation is a precious thing in gaming, and we must all give thanks that this developer is willing to deliver it time and time again.

Licensing Authorities & Testing Agencies

Meet The Author

16 Years
Experience
John Bonello
John Bonello
Content Editor Content Editor

With a passion for words, John is always thinking about what to write next. He has over 12 years of experience working with online content and as an Editor at Casinos.com, John makes sure that readers get the latest and most accurate information about the online gambling industry.

Read Full Bio

FAQs

What is the most popular slot series?
Where can I play the best online slot series?
Can I play the slot series for free?
Are progressive jackpots linked across series?

Ask the experts

Need expert help? Ask a question and one of our in-house experts will get back to you...

Get in touch
Get in touch
faqs

Test Your Luck
Not Your Spam Filter

Sign up to receive emails and promotions from Casinos.com

Casinos.com Email Signup Coins