Elk Studios bring us Oxygen, a slot set in an underwater world filled with grumpy-looking fish and other sea creatures. Elk Studios are known for making innovative slot games. Oxygen, Oxygen 2 and Oxygen 3 (2026) is a grid slot, so it comes with cluster pays rather than pay lines. Moreover, there are some cool features, such as multiplier strikes and exploding wild symbols. The game shares a lot of similarities to Pragmatic Play’s Sugar Rush, but with an underwater theme and added features. So, let’s descend to the depths and see what treasures await us.
Oxygen Slot UK Casinos
Go Fishing with 100 Spins on Big Bass Bonanza
#AD, 18+ New UK players only | 23 No Deposit Spins Winnings Have 10x Wagering Requirements | Max Cashout on No Deposit Spins is £100 | Cash Spins Winnings Are Wager-Free | No max cash out on Cash Spins | Eligibility is Restricted for Suspected Abuse | Skrill Deposits Excluded | Spins Value Are £0.10 Per Spin | All Spins Expire in 48 hours | Bonus terms apply
Deposit and Wager £10 for 50 Cash Spins on Octobeer Fortune
#AD, New players only | Deposit & wager at least £10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value £0.20 per spin | Free Spins expire in 48 hours | Bonus terms apply.
Welcome Bonus 100% up to £50 +50 Free Spins
#AD, New players only. Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £10, max. Bonus £50. Maximum amount of Free Spins is 50. Game: Book of Dead, Spin Value: £0.1. WR of 10x Bonus amount and Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.
Welcome Casino Bonus of up to 200 Spins on Book of Dead
#Ad | 18+ | Begambleaware.org | New UK Players Only. Opt-in required. Min deposit £10. Get 2 Free Spins for every £1 deposited, up to 200 Free Spins on Book of Dead. Spin value £0.10. Winnings from spins are subject to wagering requirements. Additional bonus terms and wagering conditions apply. T&Cs apply.
Bet £10, Get £10 Free Bet or 100 Cash Spins on Big Bass at the Races
#AD, New players only | Free bet minimum odds: 2.0 | Free bet value will be deducted from free bet winnings | Deposit & wager at least £10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value £0.10 per spin | Free Spins expire in 48 hours | Bonus terms apply
Oxygen Slot Information
| Oxygen | Stats |
|---|---|
| Number of Reels and Rows | 6×7 |
| Pay Lines | Cluster Pays |
| Minimum Total Bet | £0.20 |
| Maximum Bet | £100 |
| RTP | 94% |
| Max Win | 25,000x |
| Bonus Features | Free Spins, Multiplier Strike, Collector Feature, Exploding Wilds |
| Feature Buy Option | Bonus Hunt (3x bet), Multiplier Strike (10x bet), Persistent Multiplier Feature (25x bet), Bonus Game (100x bet), Super Bonus (500x bet) |
Oxygen is a 6×7 grid slot with a cluster pays system, creating wins when five or more identical symbols are adjacent to each other. Betting goes from £0.20 to a maximum of £100. Volatility is set at medium to high with an RTP of 94%. One thing that is nice to see, is that the max win is 25,000x which is a major plus. Bonus features include win multipliers and exploding wilds. Moreover, there is a free spins bonus round that can be accessed via the base game or via several bonus buy options.
How To Play Oxygen Free Slot Demo
To play Oxygen slot for free you sign up at a UK-licensed casino, or try it here. But otherwise, most online casinos offer demo slot versions, so that you can get a look and feel for the game before playing the Oxygen slot with real money. Once, you’ve set up an account, load the Oxygen demo slot in free play mode and follow these steps.
- Set Your Bet and Spin: Choose your bet amount by adjusting the stake. The minimum bet is £0.20 and the maximum bet is £100. Press the spin button to start the game. When five or more matching symbols are adjacent, horizontally or vertically, you create a win.
- Winning Clusters and Multipliers: When you get a winning cluster, the symbols in the cluster are removed. New symbols drop down to fill the gaps and possibly create new wins. This continues until no new wins are formed with the new symbols. Win multipliers are added as oxygen bubbles beneath the cascading win symbols after each winning combo. Consecutive wins in the same positions on the grid will increase the win multipliers up to a possible 2,048x.
- Wild Symbols: Look out for wild symbols during the game. They come in 3 variations: regular wilds, exploding wilds and symbol changing wilds. These symbols can help form more winning combinations and keep the game round wins ticking over.
- Special Features: Multipliers can appear through features like the Multiplier Strike, Collector, and Dealer features. Land three scatter symbols to trigger 10 free spins. You can also re-trigger free spins by landing more scatter symbols.
- Bonus Buy: If allowed in your region, you can use the X-iter feature to buy into several bonus features.
Winning Combinations & Payouts
You get 7 regular paying symbols in Oxygen, ranging from low to high-paying symbols. To form wins, you need to match at least 5 of the symbol adjacently in a cluster. Wilds can help to create pay clusters.
Low Paying: Three different coloured gem buoys: green, orange and purple. These pay out from 0.1x – 20x.
High Paying: There are 4 top paying symbols: Diving helmets, green and purple fish and a seahorse. Payouts range from 0.3x – 100x
Big Symbols: Symbols can randomly appear in sizes of 1×1, 2×2, 3×3, and 4×4. Larger symbols act as multiple individual symbols, enhancing the chance of forming winning clusters.
Special Symbols
As mentioned there are also special symbols in Oxygen slot: Wilds and Scatters.
Wild Symbol
A standard wild symbol. This is your standard wild that substitutes for any regular pay symbol to help form winning clusters.
Exploding Wild
When part of a winning cluster, it removes all symbols in an X-shape area around it, potentially creating more wins. This feature triggers only when no more winning combinations appear.
X-Blaster Wild
When part of a win, it selects a random pay symbol or wild symbol, and replaces all pay symbols in an X-shape with this selected symbol. If another X-Blaster Wild is in the path, then it triggers again. Symbols affected by multiple X-Blasters turn into wilds.
Bonus Scatter Symbol
Landing three scatter symbols triggers 10 free spins. During the free spins, multipliers are persistent, increasing the potential for larger wins. Landing additional scatters during the free spins awards extra spins.
Oxygen Bonus Game
The bonus round in Oxygen is triggered by landing three scatter symbols, anywhere on the reels. You start off with 10 free spins. If you land 2 or 3 scatters, then you receive 3 or 5 extra spins, respectively.
- Persistent Multipliers: Multipliers are persistent in the bonus round. This means that the multipliers accumulated during the free spins do not reset between spins.
- Super Bonus Round: If you land three scatter symbols together with a multiplier feature, then you trigger the Super Bonus Round. In this round, at least one multiplier feature remains persistent.
- Multiplier Strike: During the bonus round, multipliers can be placed randomly on the grid.
- Collector and Dealer Features: Collector symbol gathers all multiplier values on the reels and can act as a persistent collector if part of a winning cluster. Dealer symbol multiplies all multiplier values in a V-shaped area, which can also be persistent if part of a winning cluster.
Oxygen 2
Oxygen 2, the sequel to their popular Oxygen slot (duh). While the core gameplay remains as cluster-pays mechanics as in its predecessor, Oxygen 2 introduces fresh features and enhancements. The slot is accompanied by a soundtrack that is really nice and chill.
Oxygen 2 builds on the original’s gameplay with some new features sprinkled on top. While it for sure isn’t a revolutionary upgrade, it’s still a well-crafted slot with good win potential. Fans of the original Oxygen or cluster-pays slots like Sugar Rush will enjoy this slot. Oxygen 2 retains the 6×7 grid format and cluster-pays system from the original but come with some new features.
- Jellyfish and Octopus Features: Morphing multipliers in creative ways. Jellyfish carry multipliers across random positions, while the Octopus holds and boosts multipliers when part of a winning cluster.
- Better Bonus Game: In the Super Bonus round, you get a persistent Jellyfish and Octopus on every spin, thus increasing the potential for huge payouts.
- Super Exploding Wilds: A new take on wilds, these activate all oxygen bubbles in their path for cascading wins.
Try out the free Oxygen 2 demo over at our free slots section, to get a feel for the new features.
Oxygen 3
Oxygen 3 is the third game in ELK Studios’ underwater grid slot series, and this one feels like a stronger upgrade than Oxygen 2. The game keeps the same 6×7 cluster-pays layout, where wins form from 5 or more matching symbols touching each other. But this time the RTP is listed at 96%, which is a big improvement over the 94% RTP in the original Oxygen. The max win stays huge at 25,000x your bet, so there is still plenty of potential here.
The main new feature is The Clam, which can trigger when it is part of a win. It can then activate one of three effects. The Pearl keeps redropping as long as more of the selected symbol or wilds land. The Squid creates a Wild symbol before moving to a new position. The Starfish removes symbols, increases multiplier values, and then turns into a Wild. So, compared with the first two games, Oxygen 3 has more ways to keep cascades going and build stronger multiplier positions.
The bonus game also has an Oxygen Meter that fills up with every win. Once the meter is full, it upgrades a cluster of multipliers on the grid, which makes the bonus round more exciting when it starts to build momentum. You also still get special wilds, including Exploding Wilds and Blaster Wilds, plus the usual X-iter options where allowed.
Overall, Oxygen 3 is probably the best version of the series so far. It keeps the same multiplier-heavy underwater gameplay, but the higher RTP and extra Clam features make it feel more complete. If you liked the original Oxygen games, this one is definitely worth trying in demo mode.
Oxygen Slot FAQ
The maximum win in Oxygen is up to 25,000 times your bet. You can achieve this in the bonus round by increasing your grid multipliers to 2,048x.
The X-iter feature where available allows you to purchase several bonus features and free spins rounds, ranging from 3x – 500x costs.
Multipliers start with a 1x value for the first win on a symbol position. Each consecutive win on the same position, doubles the multiplier value, up to a maximum of 2,048x. Multipliers reset between paid spins, but are persistent during free spins.
Keep an eye out for the different wild symbols and collector symbols. They can help form winning combos and can add more win multipliers.
Conclusion
Oxygen by Elk Studios has some unique features, such as the multipliers and cool wild symbol mechanics. Furthermore, the X-iter feature offers several nice bonus options, and the cost is reasonable. But, this option is not available in the UK. Like most Elk slots, RTP is always on the low side, but they make up for that with entertaining gameplay and a huge 25,000x max win. If you are a fan of Sugar Rush and other grid slots, then we recommend giving this slots a go.
More Game Reviews
Have a look at our slot review collection and discover your next favourite fishing slot adventure. We have loads of reviews for fun and exciting games that could become your next go-to slot for hooking those big bass, marlin, and crab hauls.
