Introduction to Oxygen 3
Oxygen 3 is a casino slot from ELK Studios, plunging you once more into the depths in search of the precious O2, which, aside from being a critical element for us humans, is a driving force of gameplay in the series. Just like two of its predecessors, Oxygen and Oxygen 2, the second follow-up aims to attract players with doubling position multipliers after every win and a bunch of assisting features that will wreak havoc on the submerged grid. Together with a slightly different selection of mechanics, we also get a hint of the story progression, which advanced the Coral Creek by what seems like millennia, during which the human race became extinct, and all that's left are some architectural remnants of its achievements. Quite a solemn perspective for such a colourful and seemingly lighthearted saga, although one that may make you ponder the reasons for our existence. But, without getting too grim, let's see what hides beneath the surface that will help you reach the max win of 25,000x the bet.
If you don't feel like diving for real just yet, you can explore the game's features without risk in the demo mode available at the top of the page.
Theme, Gameplay & Payouts
Oxygen 3 is a video slot from ELK Studios with 6 reels, 7 rows, and a cluster-pays win system, requiring 5+ matching symbols to land horizontally and/or vertically adjacent. Before starting your session, you can choose your stake from a range of options, from a Min.bet of 0.2 up to a Max.bet of 100. The game offers a default RTP of 96.00%, promising stable long-term returns, and a math model running on medium-high volatility, which distributes more value to high wins while making them slightly less frequent. It's possible to win up to 25,000x the bet in any single game round, whereas the base game hit frequency comes at a rate of 33%.
In Oxygen 3, you once again dive deep into the blue waters to find what treasures have lain submerged for centuries. Upon reaching the ocean bed, you'll feel almost like you're still above the surface, with the grassy fields surrounding massive pillars that support a modern railroad track. The scene gives an impression of something going wrong with our world that made it drown completely, leaving all the comforts of the civilisation underwater. Colourful coral reefs have already started to take over, merging with the architecture to create an entirely new hybrid of a landscape. The thought-provoking picture is wrapped in detailed, polished graphics, giving the game an ultra-modern feel, which you can experience on any device, such as a desktop, a smartphone, or a tablet.
Winning in Oxygen 3 requires landing at least 5 matching symbols horizontally and/or vertically adjacent to form a cluster. Three pieces of coral, blue, green, and pink, make up the low-paying symbols, awarding from 20x to 40x the bet for a set of 32 or more matching instances. High-paying icons are represented by blue, green, and pink fish. These icons pay from 60x to 150x the bet for a cluster comprising 32+ units. Topping the hierarchy is an image of an octopus, awarding 250x the bet for combining 32 symbols. Additionally, there are Clams, which trigger certain features, three types of Wilds, and Bonus symbols in the form of a futuristic treasure chest.
Special Features & Slot Mechanics
What is the max win in the slot Oxygen 3?
You can win up to 25,000x the bet.
What features are available in the slot Oxygen 3?
The features are Avalanche, Big Symbols, Multipliers, Multiplier Strike, Clam Features, Wilds, Bonus & Super Bonus Game, and Feature Buy (X-iter).
Avalanche
Thanks to the Avalanche mechanism, you'll have a chance to score multiple consecutive wins within a single game round. Every initial combination is removed from the grid, causing the remaining symbols to drop and new ones to populate the board. This can potentially lead to more hits, thus extending the sequence until no new combinations can be formed.
Big Symbols
Any paying symbol can appear in its larger variant of 2x2, 3x3, or 4x4 in size. Big Symbols are counted as the number of individual symbols they contain.
Multipliers
Whenever a winning combination occurs on the grid, all positions it covers will be marked with Oxygen Bubbles. The next time the highlighted cell is involved in a win, it will receive a multiplier of x2. Any subsequent combinations happening on it will double the multiplier value. When a win covers several positions with multipliers, their values are added together before being applied to the payout. Multipliers are persistent throughout the same Avalanche sequence, and they're cleared before the next paid spin in the base game.
Multiplier Strike
The feature may trigger at the beginning of a spin or after any symbol drop. It places one or more clusters of Oxygen Bubbles with multipliers in random positions of the grid.
Clam Features
A Clam is a Wild symbol that may land anywhere on the grid. Whenever it becomes a part of a winning cluster, it triggers one of three modifiers.
Pearl = triggers a redrop with one random symbol type and any feature symbols locked onto the grid. The sequence of redrops continues as long as symbols matching the selected one or Wilds continue to land.
Squid = moves to random positions, generating Wilds.
Starfish = removes symbols in a random direction and adds a multiplier in the last position affected. The sequence repeats until the Starfish turns into a Wild.
Wilds
There are three types of Wilds in Oxygen 3. Regular ones that substitute for any standard symbols, Exploding Wilds that remove symbols in a cone-shaped area up and down or left and right, and Blaster Wilds that convert symbols in a plus or X shape originating from it into matching instances. Symbols converted for the second time become Wilds.
Bonus & Super Bonus Game
Landing 3 Bonus symbols anywhere on the grid triggers the regular Bonus Game. If one of the symbols in a sequence is a Super Bonus, then an enhanced variant is awarded. During both modes, multipliers on Oxygen Bubbles remain persistent between spins and an Oxygen Meter is present. Every winning combination charges it with energy, and when it's full, it triggers and upgrades a cluster of multipliers on the grid. In the Super Bonus Game, the upgrade will cover a larger area.
Feature Buy (X-iter)
Like most games from ELK Studios, the Oxygen 3 slot comes with the X-iter menu, which contains several options for triggering features and bonuses at a set price that scales with your active bet.
2.5x = Bonus Hunt with a 3-times higher chance of triggering the Bonus Game.
5x = Mega Hunt with a 6-times higher chance of triggering the Bonus Game.
25x = Clam Chowder, guaranteeing 3 Clam symbols.
100x = Regular Bonus Game.
250x = Super Bonus Game.
Final Thoughts on Oxygen 3
The position multiplier mechanism, popularised by Sugar Rush from Pragmatic Play in 2022, is still trending four years later, in 2026, having appeared in nearly every provider's roadmap in one form or another. ELK Studios explores the ocean depths for the third time to charge the precious oxygen bubbles with the power of boosting cluster wins, trying a slightly different approach than before. The series started from a basic game model enhanced by the Multiplier Strike feature, complemented by Blaster and Exploding Wilds. It gradually evolved by receiving Octopus and Jellyfish symbols in the first sequel, and now you will have Clams capable of releasing three impactful modifiers to help you along the way. Pearls, Squids, and Starfish that can emerge from them bring some genuinely attractive features, which more often than not will transform the grid in an advantageous way. Extra Wilds, sticky respins, and increasing multipliers can work wonders together with the Multiplier Strike mechanism. On top of that, both Bonus Game variants massively emphasise the role of clusters by improving the multipliers in adjacent positions after filling up the Oxygen Meter, compared to individual cells affected by the Jellyfish in Oxygen 2. All these changes, combined with the ELK's return to a default RTP of 96%, make it the strongest part of the series.
On the audiovisual side, the game follows the same vibrant, polished look we got to enjoy in the previous parts, with the backstory of the mysterious Coral Creek moving into a strange, futuristic direction, providing a consistent next chapter of the underwater tale. On the whole, it may not feel all that different from the second part, but it's still a consistent scene with some subtle new elements to match the progressing storyline.
Oxygen 3 competently expands the series' feature line-up with mechanics that emphasise the core elements even more.
