Oxygen 3

How to play and win at Oxygen 3

This free slot has been online since April 7, 2026, and is played on a 6×7 grid with cluster wins: at least 5 matching symbols connected horizontally or vertically pay, but only the largest cluster counts.
After each win, the Avalanche begins, removing useful symbols, causing others to fall, and creating new combinations with the same bet. To get the most out of it, it’s best to carefully follow the sequence of falls, as this is where the most profitable sequences can arise.

Return to Player and Volatility

In this slot machine created by ELK Studios, the medium-high volatility feels like an uneven current: for a while, the seabed remains calm, then the grid can suddenly change pace.

The RTP varies between 87.0% and 96.0% depending on the market and operator, so it should always be checked before playing.

The winning spin rate is 33%, with an average of one in three spins being a winner.

Maximum Potential and Betting Levels

Hidden deep beneath the seabed is a maximum prize of x25,000, a target with bets ranging from $0.20 to $100, allowing you to freely choose how deep you want to go, whether it’s more cautious passages or more dramatic descents.

Atmosphere and Mobile Playability

Between broken columns, suspended rails, and expanses of seagrass that have now taken over the seabed, this title creates an underwater landscape much richer than the classic ocean setting.
The image shows the signs of a vanished civilization, with modern architectural elements still visible among the ruins, while luminous corals, shells, pearls, and brightly colored creatures transform everything into a vibrant and almost surreal environment.

The contrast works well: on the one hand, there’s a reference to a lost world, on the other, a bright palette that lightens the scene and makes it immediately recognizable.
The rendering remains sharp and uncluttered even on smartphones and tablets, where the grid, symbols, and animations remain clear without diminishing the visual impact of the seabed.

Oxygen 3 vs. 4 other slots from provider ELK Studios

The Game Symbols

The lowest-paying symbols are three coral fragments-blue, green, and pink-which can award 20x to 40x the stake with a cluster of at least 32 matching symbols.

The highest-paying symbols are three fish, also blue, green, and pink, capable of paying 60x to 150x the stake when forming a cluster of 32 or more.
At the top of the table is the octopus, which with 32 connected symbols can pay up to 250x the bet.

The picture is completed by the Clam symbols, useful for activating certain features, three different types of Wilds, and the Special symbols, depicted as a futuristic treasure chest.

Special Features

In addition to the cluster grid, this title offers several features that change the pace of the game and make each spin more exciting. To truly understand how the action unfolds, it’s best to read the special symbols and the steps that can change the screen in order.

Oxygen Bubble

When a winning symbol is removed for the first time, an Oxygen Bubble appears in its position. If another symbol is removed in that same spot in a subsequent spin, the multiplier doubles. The first spin is worth x1. The bubbles remain stationary, do not fall with gravity, and continue to maintain their value even during the special phase.

Multiplier Shot

This feature can appear before symbols fall and places a group of Oxygen Bubbles on the grid, already equipped with multipliers. It can be activated in both the base game and the special phase.

Clam

The Clam also functions as a Wild, substituting for all payout symbols. If it appears in a winning combination, it opens one of three related features: Starfish, Cuttlefish, or Pearl.

Pearl

When activated, a payout symbol on the grid is chosen. From that moment, all symbols of that type remain in place. Any feature symbols already in place are also locked.
Hisses. All other pay symbols are removed and the grid fills again. After each re-spin, the win is checked, but the symbols chosen by the Pearl are not counted until the effect ends.

The cycle continues until at least one more symbol of the same type appears, or a Wild, or until the screen is completely filled with those symbols and features. Only at the end is everything cleared and the final count begins.

Cuttlefish

The Cuttlefish moves in jerky motions across the grid. Each time, it leaves a Wild on the space it just occupied and then moves to a new spot. It continues this way until it leaves the screen.

Starfish

The Starfish changes direction with each pass and can move horizontally, vertically, or diagonally. Along its path, it removes all pay symbols and activates any features it encounters. In the last space, the multiplier also increases. It repeats its cycle several times, then turns Wild.

Explosive Wild

This special Wild is activated when it forms a winning combination or is hit by another explosion, a Wild Blaster, or the Starfish. When there are no active wins left on the grid, it explodes and removes the pay symbols in two opposing areas, either vertically or horizontally, forcing the grid to refill.

Wild Blaster

This special Wild can also be activated by forming a winning combination or being hit by another explosion. Its effect transforms the pay symbols hit in an X- or Plus-shaped area into matching symbols. If a symbol already transformed is hit a second time, it becomes a Wild.

Large Symbols

During spills, 2×2, 3×3, and 4×4 symbols can appear. Each symbol counts as multiple normal symbols, depending on the space it occupies on the grid.

Chests and Special Phase

3 chests activate the special phase with 10 extra spills. In this mode, the Oxygen Meter comes into play, filling up each time a winning combination lands. When it reaches its maximum, it empties and powers up a group of multipliers on the grid.

Super Chest and Super Special Phase

If the 3 chests that activate the feature also include a Super Chest, the Super Special Phase starts with 10 extra drops. Here, the Super Oxygen Meter works the same way, but when it fills up, it activates a larger group of multipliers. Both the Oxygen Meter and the Super Counter maintain their level from one drop to the next.

Extra Drops

If 2 chests appear during this mode, 3 extra drops are added. If 3 chests appear, the extra drops increase to 5. The feature ends when the available drops run out or when the maximum win limit is reached.

X-iter

The X-iter feature allows access to additional modes available only in the base game.

• Super Special Phase directly launches the most rewarding version with 10 extra drops at a cost of 250 times the stake.
• Special Game starts the standard special phase with 10 extra drops at a cost of 100 times your stake.
• Clam Chowder guarantees a drop with 3 Clam symbols at a cost of 25 times your stake.
• Mega Hunt offers a more than 6x higher chance of triggering the special phase at a cost of 5 times your stake.
• Special Hunt increases this chance by more than 3x at a cost of 2.5 times your stake.

Our final thoughts on Oxygen3

In our games, we found a title with a strong visual identity and a structure that really comes alive when the drops start to chain together.

We especially appreciated the weight of the features on the grid, because Oxygen Bubbles, Special Wilds, and Feature symbols can really change the course of a spin.

At the same time, the medium-high volatility is noticeable, meaning the pace isn’t always generous, with slower phases that can test your patience.