Five Slots with Unique Bonus Mechanics

05/05/2025 | Categories: Gambling Guides | Published by: Joe | Last updated: 05/05/2025

Free spins are essentially the cornerstone of reel-spinning action. But what about other bonus features that add a different flavor to online slot play? Well, that is what we aim to tell you about here. If you are a dedicated Internet gambler, chances are that you are probably familiar with some of the five games discussed above, but if you are not – well, you are in for a treat, as these are games that do more than required to supply imaginative online gambling entertainment.

Reactoonz 2

Play’n GO’s Reactoonz came out in October 2017 and jazzed things up in the interactive gaming sphere via its Giantoonz, Quantum Leap, and Quantum features. It made a massive mark in the sector and made fans eagerly await a sequel to drop, which came in October 2020.

It built on the momentum the original put forward and for many, the star of the show here is the Quantometer that removes symbols when filled with Electric Wilds, which unlocks Energoon Wilds (1×1 or 2×2 wilds), Gargatoon wilds (3×3 wilds), or x2 multipliers. The game also includes Wild Pair explosions, the standard cascading system, and fluctuating tokens. So, there is a wealth of features here that keep things dynamic, and if we are being honest, bit too complicated for many casuals and newbies.

Cluster Slide

ELK Studio made its name in the sector as the creator of the Wild Toro slot, an online spinner that won the 2017 Game of the Year honor at the 13th EGR Operators Awards. It is now a gaming mainstay, and a supplier renowned for churning out high-quality releases regularly. One of this company’s not as well-known slots which is terrific is Cluster Slide, which debuted in March 2021 as a cluster-pay title with medium-high variance.

The core of this game is its Generator Meter, which fills as you create winning clusters. Each avalanche allows new tokens to slide into the positions of previously winning ones, charging the noted meter. Once full, it randomly awards one of five special wild effects: Big (expands a symbol), Random (creates two to four wilds), Multiplier (adds +1 to wins), Upgrading (boosts symbol values), or Removing (clears a symbol type). But that is not all as far as bonus features go in Cluster Slide, as if you land three B symbols, you get Wild Drops, which have three phases that add increasingly larger wilds, up to 3×3. For faster access, the X-iter feature lets you buy bonuses directly, as is usually the case in ELK creations.

Fire in the Hole

Nolimit City is a game studio which you probably know loads about. Much of the information you may have regarding this company may have stemmed from us, as we have talked so much about it here at BTCGOSU, gushing over its slots, and adding many of them to our deep library of guide articles. Here, we want to tell you about one of our favorite Nolimit spinners, Fire in the Hole.

This is a title that appeared in casinos’ game pages in March 2021, as a high-variance spinner with a ranging RTP that can be either 94.11% or 96.06%. Fire in the Hole introduced Bomb Wilds, which, when they explode, destroy nearby regular symbols and boost a win multiplier by +1 for the next cascade. These explosions occur whenever there’s any winning combination, even if the xBomb wasn’t involved.

But xBombs are just scratching the surface in terms of what Fire in the Hole has to offer concerning bonus modes, as it has a Wild Mining feature, a Lucky Wagon Bonus, Streak Respins, different modifiers, and more. We should add that in the eyes of many, the sequel to this game, which came out in February 2024, is the better of the two, but Nolimit City has set a release date for the third edition to this series to drop in the summer of 2025, so we have to wait for it to come out and render a verdict on which is the best from this trio in June/July of this year.

Money Train 2

We are sure that if you conduct a poll regarding what is the best online slot of all time, Money Train 2 will get some votes. This Relax Gaming product became available in September 2020, a year after the original, boasting redefined graphics and more complex gameplay, stunning online gamblers everywhere. It was about as bonus-feature-rich a game as there was out there at the time, and still holds up even with Money Train 4, which many consider the pinnacle of the franchise.

Money Train 2 enhances its predecessor’s formula with respins triggered when two scatters land, combining their multipliers, increasing multipliers by +1 for each non-winning spin until a prize one occurs. But the chief attraction here remains the Money Cart Bonus, activated by three or more scatters, where a special grid gets filled with unique symbols that reset spins and boost a cumulative multiplier—including value-revealing symbols. These are Payers that boost others, Collectors that accumulate values, Snipers that double others’ worth, and Necromancers that revive used special symbols.

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