Oxygen Slot Review

Based on our expert’s review. Reviewed by
ELK Studios Slot Reviews
Review by
Martin Backhouse
Updated: 20/12/2023
Review by
Martin Backhouse
Updated: 20/12/2023

Explore the ridge of Coral Creek and enjoy volatile features that could erupt at any moment in the Oxygen slot from ELK Studios. This medium variance 6×7 game comes with a 94% RTP rate and 25,000 x max wins. The slot is packed with multipliers up to 2,048x, symbol transformations, wilds, a bonus game and a super bonus game. Discover just how good this game is below in our full and unbiased Oxygen review.

Max Win
25,000 x bet
T&Cs Apply

18+. New depositors only. UK residents only. Minimum deposit $10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. T&Cs apply. #ad

ELK Studios
Type of Slot
Grid Slot
Cluster Pays
Stakes Range
20p to £100
Bonus Features
Yes (5)
Free Spins/Multiplier
Max Win
25,000 x

Oxygen Demo

18plus uk-gambling-commission online-slot-co-uk-logo agechecked-verification-provider
T&Cs Apply 18+. New depositors only. UK residents only. Minimum deposit $10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. T&Cs apply. #ad
18plus uk-gambling-commission online-slot-co-uk-logo agechecked-verification-provider
T&Cs Apply 18+. New depositors only. UK residents only. Minimum deposit $10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. T&Cs apply. #ad

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T&Cs Apply

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Oxygen Slot RTP, Details & Wager Limits

Reels/Paylines: 6×7 grid

Stakes Range: 20p to £100 per spin

RTP: 94%

Max Win: 25,000 x bet per spin

The Oxygen slot is played on a 6×7 grid and uses the Cluster Pays mechanic. Wins are formed by landing 5 or more identical symbols in a cluster that are connected vertically or horizontally. Wins are then removed and the remaining symbols will fall until they reach a new resting position. New symbols drop from above to fill in the empty gaps. This process continues until no new winners are formed.

Every winning combination will double the multiplier value on the symbol positions covered by that winning combination.

Stakes range from just 20p up to £100 per spin, thus catering to all pockets. Like all ELK slots, just hit the coins icon to the left of the reels to adjust your total bet. There are 12 predefined values to pick from. Autospins and Quick Play are also options for non-UK players.

The Oxygen RTP is 94%, which is well below the industry average but very typical of many slots from this provider. In terms of volatility, it’s in the medium range and rated 7 out of 10. The hit frequency is 36%, which is very generous compared to many other slots on the market.

The maximum win is 25,000 x the bet. Your best chance of landing the top prize will come in the Free Drops Bonus Game due to the numerous extra free drops on offer and multipliers up to 2,048x.

Theme: explore the deep blue sea

Theme: Underwater

High Value Symbol: Diver Helmet

Compatibility: Mobile, Tablet, Desktop


The Oxygen slot takes you deep under the ocean floor where there’s a shipwreck in the background as you spin away as well as bubbles appearing every now and then on either side of the grid. The title’s ironic as there is obviously no water underwater. The visuals are bold and colourful and I like the way the symbols disappear from the grid after a winning combination.

In terms of the soundtrack, it’s quite melodic but repetitive. I didn’t mind it, but you may well reach for the mute button after a while. Land the bonus feature and the audio is more upbeat to give that dramatic effect as you spin away hoping to land some winners. The background doesn’t change at all, which is a shame as I do like it when there’s a clear distinction between the base game and the bonus features.

On the reels, the different coloured gems in fishing nets make up the lower-paying symbols. These are joined by higher-paying fish and a diving helmet. The diving helmet is the most rewarding symbol, paying 1 to 100 x your total stake for 5 to 14+ in a cluster.

There are 3 Wilds in the game to be aware of. We cover those in more detail further down, but here’s a list of the symbols you will come across while you spin away:

Symbol Payouts/Info
oxygen-slot-green-gem-symbolGreen Gem 5-14+ = 0.1 to 10 x stake
oxygen-slot-orange-gem-symbolOrange Gem 5-14+ = 0.15 to 15 x stake
oxygen-slot-pink-gem-symbolPink Gem 5-14+ = 0.2 to 20 x stake
oxygen-slot-green-fish-symbolGreen Fish 5-14+ = 0.3 to 25 x stake
oxygen-slot-seahorse-symbolOrange Seahorse 5-14+ = 0.4 to 30 x stake
oxygen-slot-pink-fish-symbolPink Fish 5-14+ = 0.5 to 50 x stake
oxygen-slot-diving-helmet-symbolDiving Helmet 5-14+ = 1 to 100 x stake
oxygen-slot-green-bonus-scatter-symbolBonus Scatter 3 in view triggers free drops bonus game
oxygen-slot-wild-symbolWild Substitutes for all paying symbols
oxygen-slot-exploding-wild-symbolExploding Wild Removes all paying symbols within an X-shape area
oxygen-slot-x-blaster-wild-symbolX-Blaster Wild Random symbol is selected and replaces all paying symbols in an X-shape

Oxygen Mobile


Released on the 20th of December 2023, the Oxygen mobile slot is available to play on desktop, mobile and tablet devices. With ELK Studios being a mobile-first provider, it’s fully compatible with iOS and Android smartphones. I do, however, prefer playing slots with a larger reel size like this one on bigger screens to fully appreciate the visuals.

Oxygen Bonus Features

There are 5 bonus features in the Oxygen slot game. From oxygen bubbles and numerous Wilds to Collector and Dealer features, there’s a lot going on. Read on as we take you through everything the bonus features have to offer, starting with the Wilds.


We’ve mentioned the Wilds in the table above, but let’s break down what each one does here as most slots only come with one Wild in the game. You may also have skipped over the table above, so just in case you missed it:

  • Wild – A typical Wild that simply substitutes for all paying symbols.
  • Exploding Wild – Activates when it is part of a winning cluster. It removes all payout symbols within an X-shape area above and below itself. It will then detonate when no more winning combinations appear. All features within the X-Shape area will be triggered.
  • X-Blaster Wild – Triggers when it’s part of a winning cluster. A random paying symbol or standard Wild is selected and replaces all paying symbols in an X-Shape. Exploding Wilds or X-Blasters will turn into standard Wilds.

Multiplier features

Multipliers play a huge part in the Oxygen slot. Name the Oxygen Bubble feature, every winning combination doubles the multiplier value on each of the winning symbol positions. This can continue up to a maximum multiplier of 2,048x. The multiplier values are reset between spins but they remain persistent during the Free Drops Bonus Game.

There are also a few multiplier features that can randomly trigger on any spin:

  • Multiplier Strike – Trigegred on any symbol drop or free drop, this feature places a random number of multipliers on the grid.
  • Collector – Collects all multiplier values in view. It activates when part of a winning cluster and can be persistent.
  • Dealer – Multiplies all multipliers in the direction of the radar. This can activate when part of a winning cluster and it can also be persistent.

Free Drop Bonus Game


Land 3 Bonus Scatters in the base game to trigger this feature. All multiplier values are persistent throughout the bonus round, which is the opposite of the base game. You will start with 10 free drops and the feature will end when you run out.

2 Bonus symbols during the round will award 2 additional free drops. 3 Bonus symbols will award 5 additional free drops with no upper limit on the number of times this can happen.

Super Bonus Game

If you manage to land 3 Bonus Scatters as well as a persistent multiplier feature, you will get 10 super bonus drops. During this bonus round, multipliers are persistent like the standard Bonus Game but at least 1 multiplier feature is persistent here too. Land 2 or 3 Bonus Scatters to receive 2 or 5 additional free drops respectively.

X-iter feature

Finally, there is an X-iter feature for players located outside the United Kingdom. As always, there are 5 options ranging between 3 and 500 x the bet:

Option Cost Description
Bonus Hunt 3 x bet More than 3 times the chance of triggering a bonus feature.
Multiplier Strike 10 x bet Guaranteed Multiplier Strike.
Persistent Multiplier feature 25 x bet Guaranteed Persistent Multiplier feature.
Free Drops Bonus Game 100 x bet Guaranteed trigger of the Bonus Game feature.
Super Bonus 500 x bet Bonus Game feature with a guaranteed persistent multiplier feature.

Oxygen Review Summary: multipliers are the key to big wins

Theme & Symbols

Sounds & Music

Bonus Features

RTP (94%)

Max Win (25,000 x)


I won’t be the only person to mention that this feels like Sugar Rush from Pragmatic Play. Ok, so the theme is completely different, but the multipliers doubling each time, the wrappers and the mechanics of it all are very similar. But ELK Studios has enhanced the features to pip the  Pragmatic title in my opinion. 25,000 x max wins and medium variance help cushion the blow of the low RTP rate of 94%.

Something to also bear in mind here is the 36% hit frequency. This means that over a third of all spins on average will result in a winning combination, which is very generous. I must admit that I did trigger the Free Drop Bonus Game a few times when testing this slot thoroughly and I enjoyed plenty of multipliers too. If you’re a fan of free spins and huge multipliers, this is well worth a look. Don’t hesitate to give our free Oxygen demo slot a try first and decide for yourself.

For alternative underwater action that might take your fancy, check out Play’n GO’s Mega Don: Feeding Frenzy slot and Novamatic’s Dolphin’s Pearl Deluxe slot. They come with 20,000 x and 27,000 x max wins respectively.

  • 25,000 x bet max wins
  • Multipliers up to 2,048x
  • Medium volatility
  • 94% RTP rate

Oxygen FAQs

What is the Oxygen RTP?

The Oxygen RTP is 94%, which is well below the industry average. However, it’s very typical of slots from ELK Studios. At least the volatility isn’t too high; it’s in the medium range.

What is the Oxygen max win?

The maximum win is 25,000 x the bet. This is best achieved during the Free Drops feature as there are unlimited free drops on offer as well as multipliers up to 2,048x.

Are there any Oxygen free spins?

Yes. Land 3 Bonus Scatters in view in the base game to trigger the Free Drop Bonus Game. Free Drops are essentially free spins and you will be awarded 10 free spins before you begin. Landing 2 or 3 Bonus symbols during the bonus round will award 3 or 5 additional free drops respectively.

Is there a Oxygen slot demo?

Yes, you can play the free Oxygen slot demo here at Online-Slot.co.uk. Compatible with all devices, enjoy this bubbly release on iOS and Android devices

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