The world of online slots is an expansive one. Games are relatively easy to make in many cases, and online casinos have been big time for well over 20 years now. That means there is a lot of choice, covering almost every theme and style of game under the sun, while more new features and innovative mechanics debut regularly.

But that doesn’t mean players have to follow all the newest titles. Sometimes the classics still have a lot of value. After all, they have remained popular for a long time for a reason. That’s why the recently-assembled list of top slot games from expert aggregator Casino.ca covers almost two decades of releases – from the latest shiny hits, to some true old-school titles that have remained in in rotation at casinos for years.

These specific four online slots are highlighted from Casino.ca’s list, to be representative of the wider selection. The platform’s experienced reviewers rank games on various factors from max win to variance and RTP (or return to player), allowing slots fans to make an informed choice based on the kind of game they like to play.

Cash Eruption by IGT is Relatively New but Already Much-Loved Title

Key Features

• 5×3 reels format with 20 paylines
• Expanding Wilds
• Two bonus rounds – free spins and a cash symbol hold and respin round
• Three-tiered jackpot of up to 1000x
• 5000x maximum win

Cash Eruption was available in land-based casinos in the US for a few years before International Game Technology brought it to online casinos in 2020. It immediately proved popular and has been appearing in top lists of slots for players, casinos and expert reviewers ever since.

The game has a modern twist on the slot machine original, updating the mechanics for modern online preferences. Cash Eruption has a volcanic, Mayan civilization theme with the bonus round seeing cash symbols erupt from a giant volcano onto the reels. 

The free spins bonus offers five three spins for free scatters, with any cash symbols that appear instantly collected on. The real prizes though are in the Cash Eruption bonus. Hit six CE bonus symbols and you’ll claim that prize and then be put into a new bonus round where only CE symbols can fall. Chain wins to see if you fill the screen for the top prize, or potentially hit the Minor, Midi or Major jackpot. 

Fortunes of Olympus by Pragmatic Play is the Newest in an Award-Winning Series

Key Features

• 7×7 reels with cluster pay mechanics
• 10,000x maximum win on any single spin
• Released in December 2025
• Random multipliers of up to 5000x

Developer Pragmatic Play has certainly been a driving force in popularizing certain slot game mechanics and styles over the years. Their 2021 hit Gates of Olympus is no exception. It popularised the scatter pay mechanic, with no paylines at all and symbols paying out if more than four of them appear anywhere on the reels.

Fortunes of Olympus is the latest in this sort-of series, which is instead uses a similar but different cluster pays mechanic. This is where five symbols have to appear anywhere adjacently around each other to pay out, and the more symbols in a block the higher the payout.

Following on from the Ancient Greek mythology theme, Fortunes of Olympus is set in a gran temple on the peak of Mount Olympus in Greece, with marble pillars and golden coins aplenty. The main mechanical innovation here is a potential 2x to 500x random multiplier that can be bestowed upon any winning combination by Zeus himself.

Big Bass Splash is one of the Newer Updates in this Recently Successful Series

Key Features

• Also by Pragmatic Play
• 5×3 with 10 paylines
• High volatility but massive bonus round potential
• 5000x max win on any one spin
• Sequel to the smash hit Big Bass Bonanza

In a classic case of “if it aint broke…” Pragmatic Play’s 2021 fishing-themed slot Bass Bonanza has since spawned dozens of sequels. Including this one, which expands on the original games truck symbol to make that a core part of the game.

Mechanically, it expands on the original by adding a scatter assist feature, that gives an extra nudge potential if you hit two out of three bonus scatters, and upgrading the bonus round potential. Instead of unlocking up to 5x on any every winning spin as you pick up more fishermen symbols in the bonus, this time the fisherman gets the multiplier on collected cash fish. But the multiplier goes up to 10x for the final round.

Cleopatra is a Land-Based Classic that Still Holds Up Today

• Classic slot by International Game Technology
• First debuted in land-based casinos in 2005
• Online version launched in 2012
• 5×3 reels with 20 paylines
• Low to medium volatility
• Ancient Egyptian-theme

The Cleopatra slot might not look quite as beautiful as it’s namesake, given it came out more than decade ago now. However, the gameplay is as simple but refreshing as ever, and the 10,000x jackpot doesn’t feel old.

This is a bonafide classic slot, and despite its age it is still super fun to play today. If all the crazy multiple bonus rounds, scatter pay formats and potentially complex features of the above titles sounded somewhat confusing, Casino.ca’s experts made sure to pick some simpler, old-school slot games for you. And Cleopatra is a highlight from that selection.