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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.
Wild Multiplier
How to Trigger
Wild symbol landing on any reel position during base play in Oxygen 3.
What Happens
Each Wild carries a random x2-x25 multiplier. When participating in a winning payline, its multi applies to the line. Multiple wilds in a single line multiply together multiplicatively.
Multipliers
Range: x2, x3, x5, x10, x25.
Odds
Wild rate: ~1 per 10 spins. x25 draw: ~4% of wilds.
Strategy
Flat max bet. High-multi wilds are rare but valuable. Don't reduce stake during droughts.
| Wild Rate | ~1 per 10 |
| Multi Range | x2-x25 |
| x25 Odds | ~4% |
| Avg Multi | ~x4 |
| Stacking | Multiplicative |
Free Spins
How to Trigger
Land 3+ Scatter symbols during base play.
What Happens
10 free spins awarded in Oxygen 3. During the feature, wild multi range expands to x5-x100. Sticky wilds persist full round. Global x2 feature multi applies on all wins.
Multipliers
Feature wild range: x5-x100. Global x2.
Odds
Trigger: ~1 per 260 spins. Retrigger: ~12%.
Strategy
Main max-win feature. Stay the full 10 spins.
| Base Spins | 10 |
| Trigger Rate | ~1 per 260 |
| Max Feature Multi | x100 |
| Global | x2 |
| Retrigger Odds | ~12% |
Bonus Round
How to Trigger
Land 3+ Bonus scatters on designated reels.
What Happens
Pick-and-reveal mini-game in Oxygen 3. Choose from a set of icons to reveal cash prizes (25x-1,500x bet) or feature bonuses.
Multipliers
Cash: 25x, 50x, 100x, 250x, 500x, 1,500x.
Odds
Trigger: ~1 per 340 spins. Top prize draw: ~10%.
Strategy
Single-pick = variance. Expected value ~200x per trigger.
| Picks | 3-5 |
| Max Cash | 1,500x |
| Avg Return | ~200x |
| Trigger Rate | ~1 per 340 |
| Top Prize | ~10% |
Buy Bonus
How to Trigger
Menu option from base game.
What Happens
Direct purchase of Free Spins for ~100x bet. Skips random trigger.
Multipliers
Same as natural feature.
Odds
Always available where legal.
Strategy
Compare buy RTP to base RTP. Bankroll 500x+ for reliable buy sessions.
| Cost | ~100x bet |
| Feature | Free Spins |
| Buy RTP | ~96.3% |
| Legal | Varies |
| Bankroll Min | 500x |
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.