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ELK Studios • Deep-Sea Cluster Slot
Oxygen 3 — Avalanche Bubbles & X-iter
Six reels, seven rows, cluster pays — five or more matching deep-sea symbols form a cluster and pay. Avalanche cascades clear wins and drop fresh symbols. Oxygen Bubble Multipliers spawn during cascades, stacking values across chains. Clam Features pop open with pearl prizes. Exploding and Blaster Wilds wipe wider patches of 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 33% hit frequency, you're not starving between features either.
96.0%
Standard config. Check your casino's version.
25,000x
Oxygen Bubbles chain into massive payouts.
Mid-High
33% hit rate keeps sessions alive.
6×7
42 positions. Big Symbols up to 4×4.
Oxygen 3 Free Demo
No Registration Required
Big Win Potential
Experience Oxygen 3! Try the game mechanics and features risk-free with our free demo mode.
96.0%
RTP
25,000x
Max Win
Mid-High
Volatility
$0.20
Min Bet
$100
Max Bet
Why Play Oxygen 3 Demo?
Risk-Free Spins
Experience the full potential of Oxygen 3 using virtual credits. Learn the game rules and bonus rounds.
Master Mechanics
Discover all special features, expanding symbols, and multiplier mechanics without any risk.
Instant Play
No sign-up, no emails, no downloads. Access the full gameplay instantly from any browser.
Mobile Optimized
Try the demo on your mobile device to experience all the animations and special effects on the go.
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18+ | Play Responsibly | BeGambleAware.org
Bonus Mechanics Explained
5 mechanics drive the 25,000x max win. Here's exactly how each one works.
Oxygen Bubble Multipliers
How to Trigger
A winning position explodes and leaves an Oxygen Bubble behind.
What Happens
Each exploded position drops a bubble. Land a win on that same spot in the next cascade and its multiplier doubles — 2x becomes 4x, 4x becomes 8x. A long Avalanche chain turns the 6×7 grid into a field of doubling multipliers.
Multipliers
Doubles per repeat hit: x2, x4, x8, and climbing.
Odds
Grows with cascade length; hit frequency around 33%.
Strategy
Value scales with chain length, so the Super Bonus — where the Oxygen Meter charges — is where bubbles reach 25,000x territory.
| Start | 2x |
| Growth | Doubles |
| Grid | 6×7 |
| Hit Freq | ~33% |
| Max Win | 25,000x |
Clam Modifiers
How to Trigger
Clams pop open during Avalanche play.
What Happens
Three types. Pearl locks symbols for a redrop, Squid sprays extra Wilds across the grid, and Starfish blasts a row and drops fixed multipliers along the trail it clears.
Multipliers
Starfish plants fixed multipliers where it blasts.
Odds
Random Clam trigger; the 25x X-iter tier guarantees three Clams.
Strategy
Starfish feeds the bubble field with multipliers; Squid feeds it with Wilds. Both extend cascade chains.
| Types | 3 Clams |
| Pearl | Lock + redrop |
| Squid | Extra Wilds |
| Starfish | Blast + multi |
| Guaranteed | 25x X-iter |
Exploding & Blaster Wilds
How to Trigger
Special Wilds land during base or bonus play.
What Happens
Exploding Wilds clear symbols in a cone shape; Blaster Wilds carve plus and X patterns through neighbours. Both clear positions, and every cleared spot feeds the Oxygen Bubble chain that doubles on repeat hits.
Multipliers
Feed the doubling Oxygen Bubble multipliers.
Odds
Random Wild landings, boosted in the bonus.
Strategy
These Wilds matter most mid-chain — the positions they clear become bubbles for the next cascade to double.
| Exploding | Cone clear |
| Blaster | Plus / X |
| Feeds | Bubbles |
| RTP | 96.0% |
| Volatility | Mid-High |
Super Bonus & X-iter Buy
How to Trigger
Land 3 treasure chests, or buy in through the X-iter menu.
What Happens
The Bonus Game runs persistent multipliers between spins, with the Oxygen Meter charging on wins to upgrade multiplier clusters. X-iter offers five entry points: 2.5x for boosted trigger odds, 5x for double-trigger chance, 25x for guaranteed Clams, 100x for the regular bonus, 250x for the Super Bonus.
Multipliers
Persistent multipliers plus Oxygen Meter upgrades.
Odds
Five X-iter price tiers set your variance.
Strategy
The 250x Super Bonus is the direct line to the 25,000x cap via persistent Oxygen Meter multipliers.
| Trigger | 3 chests |
| X-iter Tiers | 5 |
| Super Bonus | 250x |
| Guaranteed Clams | 25x |
| Max Win | 25,000x |
Oxygen 3 FAQ
Got questions? We've got numbers and straight answers.
Oxygen 3 runs at 96.0% RTP in its default configuration. Watch out though — some operators set it to 94% or 92%. Always check the game info screen before you spin.
The cap sits at 25,000x your bet. That's $2,500,000 on a $100 stake. Realistically, the Oxygen Bubble multiplier chain during the Super Bonus is your best shot at the big numbers.
It sits in mid-high territory on ELK's volatility scale. You'll hit something roughly every third spin (33% hit frequency), so your balance doesn't just evaporate. But the real money hides in the bonus rounds.
Yes, it runs perfectly on iOS and Android browsers. ELK Studios builds everything in HTML5 with mobile-first design. The 6×7 grid auto-scales to any screen size.
Each sequel builds on the Oxygen Bubble core mechanic. Oxygen 3 adds three Clam modifiers (Pearl, Squid, Starfish), new Exploding and Blaster Wilds, the Oxygen Meter in bonus rounds, and bumps max win to 25,000x.
ELK's X-iter system gives you five options: Bonus Hunt at 2.5x (3× trigger chance), Mega Hunt at 5x (6× trigger chance), Clam Chowder at 25x (guarantees 3 Clams), Regular Bonus at 100x, or Super Bonus at 250x stake.