How to Play Oxygen 3
Six steps from your first spin to the 25,000x cap. Cascade Avalanche chains, double Oxygen Bubbles, unlock Clam features, choose your X-iter tier.
Set Your Bet
Open Oxygen 3 and adjust your stake between $0.20 and $100. ELK publishes a 33% hit rate but no trigger frequency for the Bonus game, so nobody can tell you how many drops it takes — start at the lower end and give yourself room. The bet applies across the whole 6×7 cluster grid automatically.
Drop the 6×7 Grid
Hit spin or use autoplay. The 6×7 grid fills with deep-sea symbols and wins resolve as Cluster Pays — five or more identical symbols connected vertically or horizontally. Winners are collected, gravity pulls the rest down, new symbols fill the gaps, and the chain keeps going while clusters keep forming. Big symbols at 2×2, 3×3 and 4×4 count as every 1×1 cell they cover.
Watch Oxygen Bubbles Compound
The first time a winner is cleared off a position, a bubble activates there at x1. Clear a winner over it again and the value doubles — x2, x4, x8 and up. Bubbles ignore gravity, so they stay anchored while symbols fall through them, and Multiplier Strike can drop whole clusters of ready-made bubbles onto the grid before a drop begins.
Open the Clam
The Clam is a Wild, and when it lands in a win it opens into one of three features. Pearl picks one payout symbol, sticks every copy of it and redrops the rest. Squid plants a Wild where it stands, moves, and plants another until it leaves the grid. Starfish rotates, strips the symbols along the line it faces, raises a multiplier at the end of the run, then turns Wild. The 25x X-iter tier guarantees three Clams on one drop.
Trigger the Bonus Game
Three Bonus symbols open 10 bonus drops with an Oxygen Meter that fills on every win and, once full, upgrades a cluster of multipliers on the grid. Make one of those three a Super Bonus symbol and you get the larger Super Oxygen Meter instead. Two Bonus symbols inside the feature add 3 drops, three add 5, and bubble values carry over between drops — which is where the path to 25,000x runs.
Choose Your X-iter Tier
X-iter starts at 2.5x. ELK's five tiers: Bonus Hunt at 2.5x (more than three times the chance to trigger in one round), Mega Hunt at 5x (more than six times the chance), Clam Chowder at 25x (one drop, three guaranteed Clams), the Bonus game at 100x, and the Super Bonus at 250x. ELK states the theoretical return is 96.0% in every one of them. Several regulated markets block bonus buys outright.
Bonus Features Explained
Each feature plays differently. Here's what actually happens — no marketing fluff.
Oxygen Bubbles & Multiplier Strike
Clear a winning symbol off a position and a bubble activates there at x1. Clear another winner over it and the value doubles — x2, x4, x8, on it goes. Multiplier Strike can also drop whole clusters of ready-made bubbles onto the grid before a drop.
The Clam: Pearl, Squid, Starfish
The Clam is a Wild that opens when it wins. Pearl sticks every copy of one chosen symbol and redrops the rest. Squid plants a Wild, moves, plants another. Starfish strips a line, raises the multiplier at the end of it, then becomes a Wild.
Exploding & Blaster Wilds
Two special Wilds. The Exploding Wild clears two cone-shaped areas around itself; the Blaster Wild converts neighbours in a Plus or X shape, and anything already converted turns Wild. Either one can set off the other.
Bonus, Super Bonus & X-iter
Three Bonus symbols buy you 10 bonus drops plus an Oxygen Meter that upgrades multiplier clusters when it fills. Make one of them a Super Bonus symbol and you get the larger Super Oxygen Meter. X-iter sells five entries, 2.5x up to 250x.
Quick Strategy Tips
Bankroll for the bonus. The 25,000x cap lives in the Super Bonus, where bubbles and the meter survive from drop to drop. ELK publishes a 33% hit rate but no trigger frequency, so plan around a budget you're willing to lose rather than a spin count someone made up.
Know the RTP. At 96.0%, this slot sits at industry standard. ELK prints the same figure for every X-iter tier, so buying in doesn't change your theoretical return. Read the RTP line in the game's info screen at your casino anyway — it takes five seconds.
Pick your X-iter tier carefully. The 2.5x and 5x tiers only raise your chance of triggering inside one round — they buy nothing if it misses. The 25x tier puts three Clams on a single drop. The 100x and 250x tiers hand you the ten bonus drops directly, and only the Super Bonus brings the larger meter.
Long Avalanche chains compound multipliers. Doubling is doubling: clear the same cell five times in one chain and that bubble is sitting on x16. Exploding and Blaster Wilds matter here less for the win they create than for the cells they clear, because every cleared cell is a bubble the next drop can double.
Ready to Try It?
Test Oxygen 3 demo before risking real money — feel Oxygen Bubbles double through cascades and Clam features modify the grid hands-on.
Try Free DemoWant the full picture? every Oxygen 3 bonus feature covers it.