Oxygen 2: Slot Overview
ELK Studios resurfaces with Oxygen 2, a sequel to the 2023 underwater adventure Oxygen. The original game, likely inspired by the success of Pragmatic Play’s Sugar Rush, introduced individual reel position multipliers that could stick in place and grow to massive values. Oxygen 2 keeps this core mechanic intact while tweaking the gameplay around the edges to deliver a fresh, bubble-filled aquatic experience.
Diving back into the depths of the ocean, players find themselves in a dimly lit underwater cavern, where the transparent gaming grid floats amid coral, pipes, and sand. The scene hints at a shipwreck or sunken submarine, though one can only hope the crew made it out safely. While Oxygen 2 doesn’t command the same instant wow-factor as games like Razor Returns, its reels are teeming with vibrant sea creatures—many of which have adapted to the trash left behind by humans. Expect to see a crab with a spanner claw or a snail making its home inside a tin can, adding a unique eco-conscious twist to the oceanic theme.
Oxygen 2: Gameplay & Features
In Oxygen 2, symbols once again drop onto a 6×7 grid, where wins are formed by clusters of 5 or more matching symbols that are horizontally or vertically connected. Players can adjust their stakes using the coin button, choosing between $0.20 and $/€100 per spin before deciding whether to activate X-iter bonus modes for enhanced gameplay. Regardless of the approach, Oxygen 2 runs on a highly volatile math model with an RTP of 94%.
Paytable & Symbols
The game features a mix of low and high-paying symbols, including:
- Low pays – Green, orange, and pink floaty creatures.
- High pays – Four distinct character symbols, each offering higher rewards.
- Wilds – Substitutes for any pay symbol. An all-wild win pays the same as the highest-value symbol.
Payouts
- A 5-symbol cluster pays between 0.1x and 1x the bet.
- A 16+ symbol cluster increases payouts to 10x to 100x the bet.
Additionally, jumbo-sized symbols measuring 2×2, 3×3, or 4×4 can land on any drop, potentially carrying multipliers to further boost payouts.
Oxygen 2: Bonus Features & Mechanics
Oxygen 2 builds on its predecessor with dynamic avalanche mechanics, multiplying oxygen bubbles, special wilds, and high-energy bonus features.
Avalanche Feature
- Symbols drop onto the reels, and winning combinations pay out.
- Regular symbols explode, while special wilds remain to trigger delayed explosions.
- New symbols cascade downward, continuing the avalanche feature until no new wins appear.
Multiplier Mechanics
Oxygen Bubbles & Multiplier Strike
- When a symbol explodes, it activates an oxygen bubble in its position.
- Each subsequent explosion on an oxygen bubble doubles its multiplier (starting from x1, up to a maximum of x2,048).
- Oxygen bubbles do not move, making their placement strategic for big wins.
- The Multiplier Strike feature can randomly trigger on any spin, placing extra multipliers across the grid.
Special Features
Jellyfish Feature
- Jellyfish randomly appear, each carrying multipliers.
- They stop on random grid positions, adding their multiplier value to any existing multipliers in that spot.
- If a Jellyfish lands on a position already containing a multiplier, the values combine, further boosting the payout.
Octopus Feature
- The Octopus randomly appears on the grid, settling behind one symbol position.
- If a win occurs on its position, the Octopus grabs multipliers from outside the winning cluster and adds them to the win multiplier.
- This effect increases the payout significantly.
Exploding Wilds & Blaster Wilds
Exploding Wilds
- When part of a winning cluster, Exploding Wilds trigger an explosion, removing all pay symbols in cone-shaped areas (left, right, up, and down).
- If no more wins are present, the Exploding Wild activates.
- Other Exploding Wilds and Blaster Wilds within the explosion range are activated.
- The Super Exploding Wild activates all unactivated oxygen bubbles behind exploded symbols.
Blaster Wilds
- When involved in a winning cluster, the Blaster Wild activates, selecting a random pay symbol or wild.
- It replaces all matching symbols in an ‘X’ or ‘+’ shape.
- Any Exploding or Blaster Wilds in the affected area are activated.
- Symbols hit by multiple Blaster Wild patterns transform into wilds.
Free Spins & Super Bonus
Free Spins
- 3 scatters trigger 10 free spins.
- All oxygen bubbles and their multipliers persist between free spins.
- The Octopus remains on the grid and moves to a new position at the start of each spin.
Super Bonus Game
- 4 scatters trigger the Super Bonus.
- In this mode, the Jellyfish feature activates before every free spin, significantly boosting multipliers.
- The bonus can be retriggered:
- 2 or 3 scatters = +3 or +5 free spins.
- 4 scatters upgrade the bonus to the Super Bonus +7 extra spins.
X-iter Bonus Buy Options
Players can instantly access special game modes through the X-iter menu:
- Bonus Hunt (3x the bet) – Each spin has 3x the chance of triggering the bonus game.
- Guaranteed Wilds (10x the bet) – Guarantees at least 3 special wilds on a spin.
- Octo Strike (25x the bet) – Guarantees an Octopus feature + at least 1 Multiplier Strike.
- Bonus Buy (100x the bet) – Activates regular free spins with an Octopus feature on every spin.
- Super Bonus Buy (500x the bet) – Activates the Super Bonus, ensuring at least 1 Jellyfish + 1 Octopus per spin.
Final Thoughts
With stacking multipliers, cascading wild explosions, and persistent features in free spins, Oxygen 2 brings a deep-sea adventure packed with high-energy mechanics and thrilling win potential.
Oxygen 2: Slot Verdict
At its core, Oxygen 2 is a well-crafted cluster pays slot that delivers a strong mix of multipliers, cascading wins, and engaging side features. If ELK Studios took inspiration from Sugar Rush when designing this slot (and its predecessor), they’ve certainly done a stellar job of refining the core mechanics while adding their own unique twists. As before, the primary goal is to flood the reels with oxygen bubbles, then land wins on top of them to double their multipliers—up to x2,048 each. It worked brilliantly in Sugar Rush, it worked in the original Oxygen, and it proves just as effective in Oxygen 2.
But Oxygen 2 isn’t just about bubble-stacking multipliers. The game introduces several complementary mechanics that elevate the experience. Two standout features are the Jellyfish and the Octopus, which can drastically alter the oxygen bubble mechanics by boosting multipliers in unpredictable ways. However, the Jellyfish can sometimes feel frustrating—they take their time floating over the reels, slightly disrupting the game’s flow. That being said, their suspense-building nature adds to the thrill, and when they work their multiplicative magic, it’s all worth it—especially when chasing the massive 25,000x win cap.
While Oxygen 2 doesn’t feel like a monumental leap forward from the first game, it does chart its own course with fresh mechanics and enhanced features. It might be more of a sidestep than a revolution, but it remains an exciting cluster pays slot packed with engaging extras and rewarding potential.