Oxygen 2

Oxygen 2 is an underwater-themed slot developed by Elk Studios with a visually captivating design, featuring a 6×7 grid and a cluster pays system. Angular, stylized fish symbols, along with sunken ship elements, create a unique atmosphere. The core game utilizes a drop mechanic, where winning clusters explode, causing new symbols to cascade down. This slot offers high volatility, with complex mechanics involving Oxygen Bubbles, Octopus, and Jellyfish features that contribute to a dynamic multiplier system. The slot has 94.0% RTP, a Bonus Game and Super Bonus Game can be triggered by landing three or four bonus symbols, and during this feature, all multipliers are persistent. Bonus game has X-iter feature, allowing players to buy directly into different bonus game modes. The bonus game also contains persistent multipliers and the ability to get additional free drops.
A comprehensive game overview is available below the section featuring the free demo version of the “Oxygen 2” slot.

Oxygen 2 Game Demo

Oxygen 2 - slot logo
  • Title: Oxygen 2
  • Developer: Elk Studios
  • Theme: Underwater, Ocean, Sea Creatures, Fish, Octopus, Jellyfish, Sunken Ship, Treasure
  • Reels: 6
  • Layout: 6×7
  • Paylines: Cluster Pays
  • Number of Symbols: 12
  • RTP: 94.0%
  • Gameplay Mechanics: Drop Mechanic, Avalanche / Cascading Wins, Cluster Pays, Big Symbols (2×2, 3×3, 4×4)
  • Bonus Feature: Bonus Game, Super Bonus Game, X-iter (Bonus Buy)
  • Free Spins: Yes, 10 in Bonus Game, with potential for more through retriggers
  • Wild: Wild, Exploding Wild, Blaster Wild, Super Exploding Wild
  • Scatter: Bonus Symbol (Treasure Chest)
  • Multiplier: Yes
  • Min / Max Bet: €0.20 / €100
  • Max Win: 25,000x the bet
  • Bonus Buy: Yes, X-iter feature with 5 different modes
Oxygen 2 Oxygen 2 Play for Real

Oxygen 2 Slot Review

An Underwater Adventure with Explosive Potential

Elk Studios’ “Oxygen 2” plunges players not just into the ocean’s depths, but into a realm where colorful marine life, intricate mechanics, and a unique multiplier system collide. The slot’s aesthetic is immediately striking, with a vibrant palette that captures the beauty and mystery of the underwater world. Here, angular, stylized fish and other sea creatures populate the reels, while a submerged, partially destroyed vessel hints at a narrative of exploration gone awry. This is a visually dense world, richly detailed with a captivating design.

Oxygen 2 - base game

“Oxygen 2” operates on a 6×7 grid, where wins are formed by clusters of 5 or more matching symbols. Unlike traditional spinning reels, this game utilizes a “drop” mechanic, where winning symbols are removed, making way for new ones to cascade down. This creates the potential for successive wins within a single “spin.” Instead of using traditional paylines, winning combinations are formed when symbols land adjacent to each other, vertically or horizontally. The symbols themselves are designed as a variety of angular, stylized fish. The minimum bet is €0.20, while high-rollers can wager up to €100 per spin. Each bet consists of 100 coins. With its maximum payout capped at 25,000 times the bet, “Oxygen 2” offers the allure of substantial rewards.

Core Gameplay and Symbol Dynamics

The core of “Oxygen 2’s” gameplay is built around its cluster-pays system, “drop” mechanic, and an innovative use of multipliers. The slot features a diverse array of symbols, each with its own payout value. Notably, the Octopus symbol is the most lucrative, rewarding players with 100 times their bet for a cluster of 16 or more. Alongside the standard symbols, the game introduces Wild symbols that substitute for any other paying symbol, helping to form winning combinations. It’s not just about matching symbols; it’s about creating a chain reaction of wins through the avalanche feature, where each successful cluster explodes, creating space for new symbols and potential new wins.

This avalanche mechanic is central to the experience. Winning symbols are not simply removed; they explode, triggering a cascade of new symbols that can potentially lead to consecutive wins. It’s this cascading effect that gives the game its sense of dynamic action. Every drop can change the layout of the grid, opening up new possibilities with each successive win. Oxygen 2 has big symbols that appear in the size of 2×2, 3×3 and 4×4. Big symbols can have multipliers, thus, the potential for huge wins is obvious in the game.

“Oxygen 2” has three types of wilds that can replace any of the fish symbols, the higher the cluster size the more the wins are paid. The first type of wild – regular Wild, replaces any pay symbol in a cluster. The second type is Exploding Wild, it triggers an explode feature when it is part of a winning cluster and removes all payout symbols in two cone shapes either facing up or down from itself or to the left or the right of itself. The third type is Blaster Wild. If the Blaster Wild explodes, a random payout symbol or Wild symbol will be selected, then it will replace all the payout symbols with selected in an X- or Plus- shaped pattern. Any Exploding Wilds or other Blaster Wilds along the pattern will be activated. All symbols affected by multiple Blaster Wild patterns will turn into Wild symbols. Super Exploding Wild activates all non-active oxygen bubbles behind the exploded symbols.

Diving into the Multiplier Ecosystem

A crucial element that sets “Oxygen 2” apart is its intricate multiplier system, which is deeply integrated into the core gameplay loop. The Oxygen Bubbles are key to this system. When a symbol explodes for the first time, an Oxygen Bubble is activated in that position. Any subsequent explosions on the same bubble position double its multiplier value, which starts at x1. These bubbles persist between drops in the bonus mode, leading to a potentially exponential increase in the win potential. The largest single multiplier is 2048. Multiplier Strike feature drops a random number of multipliers onto the reels at any time, offering the chance for a significant boost even during the base game. These bubbles do not move with the drop sequence, acting like fixed anchors of increasing value on the grid.

The Octopus feature introduces another layer of multiplier action. An Octopus can randomly appear, placing itself behind a symbol position. If a win occurs on that position, the Octopus adds additional multipliers from outside the winning cluster to the overall win multiplier, further amplifying the payout.

The Jellyfish feature introduces yet another multiplier dimension. One or more Jellyfish can appear, each carrying a multiplier. They move to random symbol positions, adding their multiplier to that position. If a Jellyfish lands on a position that already has a multiplier, both multipliers are combined and then added to the existing one, creating a snowball effect. It is not easy to understand all the nuances of this slot, so if you do not understand the meaning of the bonus, functions, then run the demo version of the slot and open the built-in game help by clicking (i).

Oxygen 2 - free drops

Bonus Game and Super Bonus Game

The depth of “Oxygen 2” is further revealed in its bonus game modes. Landing three Bonus symbols (treasure chests) triggers the standard Bonus Game, awarding 10 free drops. During this mode, all multipliers are persistent between drops, and the Octopus appears in a random position at the start of each free drop. This means that any multipliers accumulated during a free drop will carry over to the next one, creating the potential for truly massive wins as the bonus round progresses.

Landing four Bonus symbols triggers the Super Bonus Game, which takes the excitement to another level. In this mode, the Jellyfish feature is triggered on every free drop, ensuring a constant stream of multipliers. Both the Bonus Game and Super Bonus Game can be retriggered. The regular Bonus game can be upgraded to Super Bonus if you land 4 bonus symbols. 2, 3 or 4 bonus symbols give extra +3, +5 and +7 free drops respectively. This persistence of multipliers across free drops is what makes the bonus rounds so lucrative.

The game also features the X-iter mechanic, which is a signature of Elk Studios. This feature allows players to buy directly into different game modes, each offering a unique set of conditions and potential rewards. For instance, players can purchase entry into the Super Bonus Game for 500 times their bet, guaranteeing at least one Jellyfish and one Octopus feature on each free drop. While the X-iter feature offers a shortcut to high-volatility action, it comes with a higher cost, aligning with the risk-reward profile favored by experienced players.

X-iter has five modes in Oxygen 2. The first one is Bonus Hunt – you have 3 times more chances to trigger the bonus game at the cost of 3x of your bet. Special Wilds – guarantees at least three special wilds at the cost of 10x the selected bet. Octo Strike mode guarantees a drop that has an Octopus feature and at least one Multiplier Strike feature at the cost of 25x the selected bet. Bonus mode guarantees entry to the bonus game with an Octopus feature in each free drop at the cost of 100x the selected bet. The most expensive X-iter feature is Super Bonus that costs 500x the selected bet, it guarantees entry to the super bonus game with a minimum of one Jellyfish feature and one Octopus feature in each free drop. The theoretical payout (RTP) for all X-iter game modes are 94.0%.

“Oxygen 2” is a game that rewards patience and a strategic approach, it’s recommended to play. The interplay between the avalanche mechanic, the various multiplier features, and the persistent nature of multipliers in the bonus rounds creates a gameplay experience that is both highly engaging and potentially very rewarding. While the base game offers a steady stream of action, it’s the bonus rounds where the game’s true potential is unleashed.

Author: Vlad Hvalov

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