Oxygen 2 (ELK Studios) Slot Review

Oxygen 2 (ELK Studios) Slot Review

After the bubbling success of its predecessor, ELK Studios invites players to take another deep dive into aquatic slot action with Oxygen 2. Released on March 4, 2025, this sequel builds upon the foundation laid by the original Oxygen, offering an enhanced, feature-rich experience within a familiar yet revamped underwater world. Inspired by the cluster pays mechanics made popular by games like Sugar Rush, Oxygen 2 retains the core concept of position-based multipliers while introducing new layers of complexity through innovative features like Jellyfish, Octopus, and evolved wild mechanics. 

Played on a transparent 6×7 grid, Oxygen 2 thrives on cluster pays, where groups of 5 or more matching symbols trigger wins. With a high volatility math model, a capped RTP of 94%, and a tempting 25,000x max win, this slot caters to players who enjoy high-risk, high-reward gameplay packed with cascading wins, growing multipliers, and explosive features. 

Oxygen 2 isn’t just a rehash—it’s a deeper, more intricate dive into ELK Studios’ aquatic adventure, designed to keep players hooked with its combination of vibrant visuals, dynamic features, and thrilling win potential.

Design and Graphics 

Oxygen 2 embraces a darker, more mysterious aesthetic compared to the bright and playful vibe of the original. The grid now floats in a dimly lit, submarine graveyard-like setting filled with coral, pipes, and remnants of human debris. The artistic shift gives the game a slightly edgier tone, though it still maintains a cartoonish charm through its colorful cast of sea creatures.Symbols include quirky marine life that seem to have adapted to human pollution—think crabs with spanners and snails in tin cans—adding personality and humor to the underwater dystopia. The visual effects shine when features trigger: oxygen bubbles expand across the grid, multipliers stack and glow, and wilds explode in satisfying bursts. 

While not as instantly eye-catching as some ocean-themed slots like Razor Returns, Oxygen 2’s graphical polish and subtle animations enhance immersion, creating an engaging backdrop for the feature-packed gameplay.

Gameplay Mechanics 

At its heart, Oxygen 2 is a cluster pays slot driven by cascading wins and progressive multipliers. Each spin drops symbols onto the 6-reel, 7-row grid, with wins forming when 5+ identical symbols connect horizontally or vertically. Winning clusters explode, allowing new symbols to drop in—a familiar avalanche mechanic that keeps the action flowing. 

Core Mechanics: 

Oxygen Bubbles & Multipliers: Each first-time win on a position activates an oxygen bubble (x1 multiplier). Consecutive wins on that spot double the value, up to a massive x2,048. 

Multiplier Strike: Randomly places additional multipliers across the grid, increasing potential even in the base game. 

Big Symbols: Pay symbols and wilds can land in oversized 2×2, 3×3, or 4×4 formats, enhancing cluster sizes and sometimes carrying multipliers. 

What sets Oxygen 2 apart is how it integrates complementary mechanics to enhance the multiplier-driven gameplay loop, making every spin a potential chain reaction of escalating rewards.

Sound and Music 

The soundtrack in Oxygen 2 complements its underwater theme perfectly. A subtle, ambient score plays during standard spins, evoking the sensation of being submerged in a quiet, mysterious ocean grotto. However, as features activate and multipliers grow, the audio intensifies, introducing dynamic sound effects like bubbling pops, explosive detonations, and electronic flourishes that heighten anticipation. 

The playful noises of Jellyfish and Octopus animations, along with the sharp cues for exploding wilds, create a lively soundscape that keeps players engaged. ELK Studios has once again demonstrated its knack for blending atmospheric music with reactive sound effects to elevate the gameplay experience.

Bonus Features 

Oxygen 2 comes loaded with features that build upon the base game mechanics, offering multiple ways to unlock big win potential.Oxygen Bubbles & Multiplier Strike 

Oxygen Bubbles: Activated on first-time wins, doubling with each consecutive hit. 

Multiplier Strike: Randomly deploys multipliers onto the grid, offering surprise boosts even during dry spells. 

Jellyfish & Octopus Features 

Jellyfish: Float across the grid, adding their multiplier to any position they stop on. If they land on an existing multiplier, values stack. 

Octopus: Appears randomly or at the start of free spins, hiding behind symbols. When triggered by a win, it adds a random multiplier to the payout. 

These features create a layered multiplier system where strategic positioning and luck can lead to explosive payouts. 

Exploding Wild & Blaster Wild 

Exploding Wilds: Clear symbols within two cone-shaped areas, activating when no further wins are possible. 

Blaster Wilds: Replace symbols in an X or plus-shaped pattern upon being part of a win. Multiple overlapping patterns turn affected symbols into wilds. 

Super Exploding Wilds: Trigger all unactivated oxygen bubbles within their blast zone. 

These wild mechanics introduce volatility spikes, clearing space and triggering chain reactions for massive clusters. 

Free Spins & Super Bonus 

3 Scatters: Award 10 free spins where oxygen bubbles and multipliers persist. 

Octopus: Always active in bonus rounds, moving to random positions each spin. 

4 Scatters: Upgrade to the Super Bonus, with guaranteed Jellyfish triggers on every spin. 

Retriggers: Landing 2 or 3 scatters grants +3 or +5 extra spins, while 4 scatters award +7. 

Persistent multipliers and feature activations make the bonus rounds the key to unlocking Oxygen 2’s full potential. 

X-iter Modes 

For players eager to dive straight into the action, Oxygen 2 offers several bonus buy options:Bonus Hunt – 3x bet for increased bonus chance. 

Special Wild Spin – 10x bet for guaranteed special wilds. 

Octo Strike – 25x bet for guaranteed Octopus and Multiplier Strike. 

Bonus Game – 100x bet for standard free spins with Octopus active. 

Super Bonus – 500x bet for the ultimate setup with Jellyfish and Octopus features every spin. 

These options cater to high-risk players seeking immediate access to Oxygen 2’s most lucrative features. 

Betting Options and Payouts 

Oxygen 2 offers a flexible betting range of €0.20 to €100 per spin, appealing to both casual players and high-rollers. While the RTP remains capped at 94%, consistent with many modern ELK slots, the true appeal lies in its explosive potential. 

Payout Structure: 

Low Symbols: Pay 0.1x to 1x for 5+ clusters. 

High Symbols: Pay up to 100x for clusters of 16+. 

Wild Clusters: Pay equivalent to the highest-paying symbol. 

The combination of oversized symbols, stacking multipliers, and feature synergy is where Oxygen 2 shines, offering a path to its impressive 25,000x max win—though, as always, that figure remains aspirational for most players.

Conclusion 

Oxygen 2 is a polished and feature-rich sequel that successfully deepens the mechanics of the original while introducing fresh elements to keep gameplay engaging. ELK Studios has taken clear inspiration from cluster hits like Sugar Rush, but with the studio’s signature twist—greater volatility, layered mechanics, and a more unpredictable ride. 

The addition of the Jellyfish and Octopus features, along with enhanced wild mechanics, ensures that no two sessions feel the same. However, the game’s reliance on multiplier buildup and feature synergy means players will need patience—and a bit of luck—to unlock its full potential. 

While Oxygen 2 may not revolutionize the cluster pays genre, it offers a compelling, chaotic underwater adventure for players who enjoy high volatility slots packed with interactive features. Whether you’re chasing massive multipliers or just enjoying the cascade of bubbles and blasts, Oxygen 2 is a worthy sequel that breathes new life into ELK Studios’ aquatic series. 

If you’re ready for a turbulent dive filled with explosive surprises and deep-sea treasures, Oxygen 2 is well worth a spin.