Oxygen 2

Oxygen 2 Slot Review

ELK Studios have built a reputation for crafting innovative, feature-rich slots that prioritise engaging mechanics over simplistic design. Oxygen 2 continues that tradition, improving upon its predecessor whilst maintaining the core elements that made the original compelling. This underwater-themed sequel arrives with a refreshed aesthetic and refined feature set, combining persistent multiplier systems with new mechanics that feel both purposeful and distinct.

Base Game & Features

Oxygen 2 operates on a 6×7 grid with Cluster Pays mechanics, meaning winning clusters form by adjacent matching symbols rather than traditional paylines. The game features a staggering range of mechanics that interact to create varied and engaging base game sessions. Bet ranges from £0.20 to £100, catering to both casual players and high-stakes enthusiasts.

The foundation of Oxygen 2’s gameplay rests on the Oxygen Bubble multiplier system. These bubbles appear randomly on the grid and carry multiplier values starting at x1, doubling each time a winning symbol lands on an active bubble position. The maximum value a single Oxygen Bubble can reach is a formidable x2,048. What makes this mechanic particularly compelling is that these multipliers remain unaffected by the Avalanche Feature, ensuring their persistent accumulation throughout a spin.

Avalanche & Cluster Mechanics

When winning clusters form, the Avalanche Feature removes those symbols from the grid, allowing new symbols to cascade downwards. This creates a chain-reaction opportunity where subsequent cascades can form additional winning combinations. The beauty of this system is that Oxygen Bubbles persist through the Avalanche process, meaning multiplier values continue building across the entire sequence of cascades.

Special Symbols & Wilds

Oxygen 2 features multiple wild varieties, each with distinct mechanics. Standard Wilds substitute for all paytable symbols, providing straightforward win enhancement. Exploding Wilds operate differently—when they land, they remove symbols in a two-cone-shaped area radiating upwards, downwards, leftwards, and rightwards from their position. This creates space for new symbols to cascade, often leading to additional winning clusters.

Blaster Wilds activate when they form part of a winning cluster. Upon activation, they replace symbols in either an X or Plus-shaped pattern around their position. When multiple Blaster Wilds are caught in each other’s crossfire patterns, they trigger cascading transformations into regular wilds, amplifying the cascade potential.

Super Exploding Wilds serve as a premium variant, triggering all inactive Oxygen Bubbles on the grid simultaneously. This creates a sudden multiplier boost moment that can dramatically shift a spin’s outcome.

Jellyfish & Octopus Features

The Jellyfish feature represents one of Oxygen 2’s most significant improvements over its predecessor. Jellyfish symbols trigger when they land alongside an active Oxygen Bubble multiplier. Upon activation, the Jellyfish floats across the reels, stopping at random symbol positions where it adds the carried multiplier value to those positions. This mechanic directly addresses a criticism of the original—building massive multipliers feels considerably less daunting with the Jellyfish providing assistance.

The Octopus feature triggers when an Octopus symbol lands on a winning cluster position. Once activated, the Octopus adds random available multipliers from the grid to the winning cluster, effectively combining multiple bubble values into a single powerful win. The Octopus persists throughout Free Spins and repositions randomly on each spin, maintaining its threat level throughout bonus rounds.

Multiplier Strike & Random Features

Multiplier Strike randomly positions a number of multiplier bubbles across the grid, both during base game and Free Spins. This sudden injection of multiplier opportunities adds volatility and can transform otherwise mundane spins into significant wins.

Oxygen 2 Bonus Features & Free Spins

Free Spins in Oxygen 2 arrive through scatter symbols. Landing 3 Scatter symbols triggers 10 Free Spins, whilst 4 Scatters unlock Super Free Spins—a premium bonus mode where the Jellyfish feature triggers automatically on every spin.

A crucial distinction of Oxygen 2’s Free Spins: all Oxygen Bubble multipliers persist through the bonus round and do not reset between spins. This creates extraordinary win potential as multipliers accumulate throughout the entire free spins sequence. Combined with persistent Octopuses and regular Multiplier Strikes, Free Spins sessions can escalate from moderate multipliers to genuinely impressive values.

Retrigger mechanics reward sustained play: 2 Scatters during Free Spins awards +3 additional spins, 3 Scatters grants +5 spins, and 4 Scatters upgrades the mode to Super Free Spins with +7 additional spins. This structure encourages longer bonus sessions and provides multiple escalation pathways.

X-iter Bonus Buy Options

Oxygen 2 includes five distinct X-iter bonus buy tiers, allowing players to accelerate directly to bonus features at increasing costs. Bonus Hunt increases Free Spins trigger chance by more than 3x at 3x bet cost—ideal for players seeking consistency. Special Wilds guarantees a minimum of 3 special Wilds at 10x bet, flooding the grid with feature-triggering symbols.

Octo Strike at 25x bet guarantees both the Octopus Feature and one Multiplier Strike activation, creating immediate synergy between key multiplier mechanics. The Bonus Game entry at 100x bet grants direct Free Spins access with a guaranteed Octopus symbol on every spin. Finally, Super Bonus Game at 500x bet ensures minimum Jellyfish and Octopus appearances per spin, maximising feature interaction throughout the bonus round.

Our Honest Verdict

Oxygen 2 proves to be a worthy sequel that successfully builds upon what made the original exceptional. ELK Studios have maintained the core multiplier-based design whilst introducing mechanisms—particularly the Jellyfish feature—that genuinely improve gameplay flow. The underwater aesthetic remains captivating, combining vibrant angular marine life with ruins of sunken vessels into a cohesive, immersive environment.

The 25,000x maximum win cap represents impressive win potential without feeling unrealistic given the game’s high volatility classification. The persistent multiplier system in Free Spins creates genuine escalation opportunities, and the feature synergy between Oxygen Bubbles, Jellyfish, and Octopus mechanics feels intentional rather than chaotic. For ELK Studios enthusiasts and players seeking innovative multiplier systems, this sequel delivers.

That said, Oxygen 2 isn’t without compromise. The removal of persistent multipliers in the base game—a feature of the original—represents a step backward for those who appreciated continuous bubble building during standard play. Additionally, the hit frequency sits at approximately 29.40%, lower than the original’s 36%, meaning dry spells between winning clusters will feel more pronounced. The Jellyfish animation, whilst visually striking, can occasionally slow gameplay pacing when animations don’t translate to significant wins.

High volatility with lower hit frequency positions Oxygen 2 firmly for experienced players comfortable weathering variance in exchange for explosive multiplier potential. Casual players seeking consistent base game action may find the long stretches between significant wins frustrating. For those chasing innovation paired with genuine win opportunity, however, Oxygen 2’s mechanical depth rewards patience and strategic bonus buy selection. This is a game that respects player intelligence and bankroll management—something increasingly rare in the modern slot landscape.

Frequently Asked Questions

• What is the RTP of Oxygen 2?

  Oxygen 2 by ELK Studios has an RTP of 94%. This represents a standard return-to-player percentage for contemporary video slots, meaning players can expect to recover 94 pence for every pound wagered over extended play.
• What is the maximum win on Oxygen 2?

  The maximum win on Oxygen 2 reaches 25,000x your stake. This substantial win potential is achieved through complex feature interactions—particularly the Oxygen Bubble multiplier system that individually can reach 2,048x on a single symbol, combined with Jellyfish and Octopus features that multiply these base multipliers.
• How volatile is Oxygen 2?

  Oxygen 2 is classified as high volatility. High volatility means winning clusters arrive less frequently but deliver substantially larger payouts. The hit frequency rate stands at approximately 29.40%, making it suitable for experienced players with adequate bankrolls who appreciate the balance between risk and explosive win potential.
• Does Oxygen 2 have free spins?

  Yes, Oxygen 2 features free spins triggered by scatter symbols. Landing 3 Scatters awards 10 Free Spins, whilst 4 Scatters unlocks Super Free Spins where the Jellyfish feature triggers automatically each spin. During free spins, all Oxygen Bubble multipliers persist and accumulate throughout the bonus round without resetting between spins.
• Can I play Oxygen 2 on mobile?

  Yes, Oxygen 2 is fully optimised for mobile devices. The game works seamlessly on both Android and iOS smartphones and tablets, maintaining the same visual quality and gameplay experience as the desktop version across all device resolutions.
• Does Oxygen 2 have a bonus buy feature?

  Yes, Oxygen 2 includes X-iter bonus buy options with 5 distinct tiers: Bonus Hunt (3x bet), Special Wilds (10x), Octo Strike (25x), Bonus Game (100x), and Super Bonus Game (500x). Prices range from approximately €0.60 to €50,000 depending on your chosen stake and buy option.
• What are the main features in Oxygen 2?

  Oxygen 2 combines multiple mechanics: Cluster Pays with Avalanche cascades, Oxygen Bubble multipliers (up to 2,048x), Jellyfish symbols that add multipliers to random positions, Octopus features that combine multiple multipliers, Exploding Wilds, Blaster Wilds, Multiplier Strike random injections, and persistent multiplier carry-through in Free Spins. The 6-reel, 7-row layout accommodates this complexity smoothly.
• What is the Oxygen Bubble multiplier system?

  Oxygen Bubbles represent Oxygen 2’s core multiplier mechanic. When any winning symbol lands on an active bubble, that multiplier doubles (starting from x1). These multipliers persist throughout Free Spins without resetting, creating accumulation opportunities. Individual bubbles can reach a maximum value of 2,048x. Bubbles remain unaffected by the Avalanche Feature, maintaining their values through cascade sequences.