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ELK Studios • Deep-Sea Cluster Slot
Oxygen 3
Six columns, seven rows, cluster pays — five or more identical symbols connected vertically or horizontally. ELK's Avalanche collects the winners and drops fresh symbols in. Every cleared position activates an Oxygen Bubble that doubles each time it clears again. The Clam opens into a Pearl, a Squid or a Starfish, and two special Wilds blast their own patterns through the grid.
96.0%RTP
25,000xMax Win
ELK StudiosProvider
Avalanche, Bubbles, Clams & Wilds
Three games in and ELK Studios still hasn't run out of ideas. Oxygen 3 drops you onto a 6×7 grid where clusters of 5+ matching symbols pay out — no paylines needed. Winning symbols vanish through the Avalanche mechanic, and fresh ones cascade down. Simple enough, right? But here's where it gets interesting.
Every exploding symbol leaves an Oxygen Bubble on its position. Hit that same spot again and the multiplier doubles. Then doubles again. The longer your Avalanche chain runs, the crazier those multipliers stack. Add in Big Symbols (up to 4×4), three different Clam modifiers, and two types of special Wilds — you've got a slot that rewards patience and pays in bursts. At 96.0% RTP and a published 33% hit rate, you're not starving between features either. ELK doesn't print a volatility score for this one, so don't trust anyone who quotes you a star count.
96.0%
Same figure on every X-iter tier.
25,000x
Oxygen Bubbles chain into massive payouts.
33%
Published hit rate. ELK prints no volatility score.
6×7
42 positions. Big Symbols up to 4×4.
Where to Play Oxygen 3
Licensed platforms offering bonuses and fast payouts.
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18+ | Play Responsibly | BeGambleAware.org
Bonus Mechanics at a Glance
Four mechanics drive the 25,000x cap. Here's what sets each one off — the full breakdown, with ELK's own wording, lives on the bonus features page.
Oxygen Bubbles & Multiplier Strike
A winning symbol is cleared from a grid position, or Multiplier Strike fires before a drop.
The Clam — Pearl, Squid, Starfish
The Clam symbol is a Wild. If it forms part of a winning cluster it opens straight after win evaluation.
Special Wilds & Big Symbols
An Exploding or Blaster Wild lands in a winning cluster, or is caught by another blast.
Bonus Game, Super Bonus & X-iter
3 Bonus symbols open the Bonus game. If one of them is a Super Bonus symbol, the Super Bonus opens instead.
Oxygen 3 FAQ
Got questions? We've got numbers and straight answers.
ELK Studios prints 96.0% in the game client, and the studio states the same theoretical return applies to every X-iter buy tier — the 250x Super Bonus is no better or worse on paper than a plain spin. Still worth opening the info screen at your casino, since operators can be shipped alternative builds.
The cap is 25,000x your bet, and a round ends the moment it's reached. ELK does not publish how likely that is — the max-win probability field in its own client is left blank — so treat the number as a ceiling, not a forecast.
ELK doesn't publish a volatility rating for this one, so we won't invent a star count. What the studio does publish is a 33% hit rate, which means roughly one drop in three pays something. The shape of the game — doubling bubbles that only matter on long chains — tells you where the variance hides.
Yes. It's an HTML5 build that runs in any modern iOS or Android browser, and the 6×7 grid rescales to the screen you're holding. ELK recommends 1600×900 at 16:9 for desktop, which is just a sizing hint, not a requirement.
It only exists inside the Bonus game. Every winning combination fills it a little; when it's full it empties and upgrades a cluster of multipliers already on the grid. The Super Bonus runs a bigger version of it, and the meter level carries over between bonus drops instead of resetting each time.
ELK's X-iter menu offers five: Bonus Hunt at 2.5x (more than three times the chance to trigger the Bonus game), Mega Hunt at 5x (more than six times the chance), Clam Chowder at 25x (one drop with three guaranteed Clams), the Bonus game at 100x, and the Super Bonus at 250x. Several regulated markets block bonus buys entirely.