The truth is nobody has actually counted, but rough estimates put the number of slots online at between 900,000 and 1.8 million, and that number is growing daily. 2026 is shaping up to be another strong year for new releases but there’s long-running favourites that keep popping up on recommended lists, mostly thanks to how their features are built and how they play out over time.
Some up the tension in gameplay with big swings, others focus on steady mechanics, but each one brings something a little different to the table, which is why online slots games have never been so popular.
Sweet Bonanza – still going strong
Sweet Bonanza from Pragmatic Play was one of the first games that used a cluster system, where matching symbols land anywhere on the grid, instead of traditional reels. When they connect, they drop away and new ones fall in.
The free spins round is where most of the action builds. Multipliers, known as Candy Bombs, can land and stack together, which is what gives the game its reputation for larger outcomes. There’s also an Ante Bet option in some places, which increases the chance of triggering that round.
With an RTP of 96.51% and a high volatility level, it’s not about constant wins. It’s more about those moments when the multipliers line up during free spins and push things further than expected.
Money Train 2 – packed with features
Money Train 2 by Relax Gaming takes a very different approach. It sticks to a Wild West setting but mixes in mechanical elements, giving it a slightly unusual look.
The main draw here is the bonus round. Once triggered, the game shifts into a respin format where symbols stay in place and multipliers build up. Special character symbols like Collector, Sniper, and Necromancer can pop up too, changing how the round plays out, sometimes quite dramatically.
It’s a high volatility game with a listed max win of up to 50,000x the stake, which puts it near the top end of what’s available. The base game can feel quiet at times, but the bonus round is where everything is designed to come together.
Book of Ra Deluxe – the Egyptian mainstay
Book of Ra Deluxe is one of those titles that never really disappears. Developed by Novomatic, it sticks to a simple five-reel layout and a familiar setup so anyone looking for a straightforward format usually ends up here at some point.The free spins feature includes expanding symbols, which can cover entire reels and have an immense impact on how results play out.
Big Bass Mission Fishin’ – building on a series
Big Bass Mission Fishin’ from Pragmatic Play continues the fishing theme that’s been doing the rounds for a few years now.
The main mechanic, as always, revolves around collecting values during free spins. Certain symbols gather amounts shown on others, and multipliers can increase as the feature progresses.
Gonzo’s Quest – still part of the conversation
Gonzo’s Quest by NetEnt has been around long enough to be considered a classic slots game at this point.
The Avalanche feature, with symbols falling into place, takes over standard spins, and of course a win is followed by a cascade where winning symbols disappear. Each consecutive cascade increases a multiplier, which carries into the free spins round as well.
The theme follows an explorer searching for lost cities, but it’s really the mechanics that have kept it relevant. Even with newer releases each year, it still gets mentioned when people talk about well-known slot formats.