Oxygen 2 Slot 

ELK Studios implements its cluster pay expertise in the Oxygen 2 slot, an underwater, fish-filled release that made its way onto casino platforms in March 2025. As can be denoted from the number in its name, this title is a direct sequel to the original Oxygen slot, which had already become a popular release from the Swedish design house. In regards to the follow-up, the visual style has been altered to provide a fresh aesthetic, as well as there being mega symbols, multipliers, and symbol removal mechanics to differentiate the Oxygen 2 slot from its predecessor.

Rivalling the size of some Megaways slots, the playtable featured in the Oxygen 2 slot has a 6x7 layout, the entirety of this being completely see-through. As we have already touched upon, this game makes use of a cluster pays system instead of your usual paylines, something which ELK Studios have become popular for due to their inclusion of such systems across many of their creations. Off to the left of all this is the coral-infused bubbling Oxygen 2 slot logo, its design matching the visual style across the backdrop.

A sunken vessel of some sort can be seen sitting on the seabed backdrop of the Oxygen 2 slot. The metal contraptions and mechanisms have coral, seaweed and other aquatic flora growing from inside them, injecting some colour to the depths of the ocean. An opening in this submerged carrier reveals the deep blue that stretches way back into the distance, with a couple of mines being attached to the sea's bottom, too. Unlike Big Bass Splash and Fishin Frenzy Megaways, the visuals here are different to your usual fishing-focused titles.

A set of coloured buoy floats make up the lower-valued symbols in the Oxygen 2 slot, something which is already unique compared to other underwater-based online slot games. The remainder of the symbols depict different aquatic creatures, all of which wear sunken metal and are a different colour too.

Lower Value Symbols:

Green Buoy Float

Orange Buoy Float

Pink Buoy Float

Medium Value Symbols:

Green Sea Snail

Yellow Crab

Higher Value Symbols:

Pink Fish

Red Octopus

Moving onto bonus symbols, there is a treasure chest scatter, a collection of jellyfish which could land with multipliers on their slimy skin, a separate octopus scatter, mine wilds and some air bubbles, the latter of which fit the name of this Oxygen 2 slot.

Like with other ELK Studio cluster pay titles such as Cygnus 5, the Oxygen 2 slot features a cascading system which removes symbols from the screen if they happen to be involved in a matching cluster. As the symbols explode and disappear, this will activate an oxygen bubble in their place, which starts at 2x. If any of the new symbols that fall down from above and fill the gap are then involved in another cluster in the same spin, this could see the oxygen bubble multiplier double each time.

The mines in the Oxygen 2 slot represent wilds, being able to substitute for all buoy, float and aquatic creature symbols. However, there are 3 types of these, each of which behaves differently:

Regular Mine Wild: Substitutes for all symbols with no nuanced ability.

Exploding Mine Wild: If involved in a cluster, this explodes and removes two cone-shaped areas adjacent to it, either vertically or horizontally.

Blaster Mine Wild: If involved in a cluster, a random base game symbol is selected before replacing symbols in a plus-shape or X-shape from the wild's original position.

The Oxygen 2 slot also features mega symbols, which could appear following a cascade of the reels. Like in Tropicool 4, these could either be 2x2, 3x3 or 4x4 in size, and potentially feature multipliers too.

If a cluster happens to appear adjacent to an orange octopus scatter in any random spin, this may trigger the Octopus feature. In this, the octopus will stretch out its arms, triggering a random multiplier value. What’s more, if players manage to trigger the Oxygen 2 free spins round by landing 4 or more treasure chest scatters simultaneously, each spin will have a persistent octopus scatter that moves to new positions randomly. This is not the only nuance in the free spins, as any oxygen bubble multipliers remain in between spins as opposed to resetting like in the base gameplay.

At BoyleSports Games, all ELK Studio creations are compatible with mobile devices. The Oxygen 2 slot features the same HTML5 framework as all of their releases, and this cross-compatible software maintains a high level of quality across computers, smartphones, and tablets, no matter their screen size.

Everything considered, it is clear why the Oxygen 2 slot has become a popular release from ELK Studios. It seamlessly blends a visually impressive, underwater theme alongside a myriad of unique modifiers, bonuses, and mechanics that craft a multilayered blueprint.

If this Oxygen 2 slot impresses you, the Catemple slot and Nitropolis 4 titles are also from ELK Studios. 

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