Queen of Sirens Slot Review
by EvoplayReleased Jun 12, 2025
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Underwater 3x3 hold-and-win with Octopus collector that absorbs all values, Luck of Aurora cell multipliers, and Ultra Bonus Game.
Specifications
| Game Type | Slots |
|---|---|
| RTP | 95.97% |
| Volatility | High |
| Max Win | 4,313x |
| Grid | 3x3 |
| Paylines | Central line activation |
| Min Bet | $1 |
| Max Bet | $75 |
| Hit Freq | 3.03% |
Queen of Sirens Slot Overview
A red-haired mermaid drifts beside a nine-cell grid in a flooded temple, and nothing on that grid pays. No paylines, no paytable, not one winning combination. Every symbol is a bonus symbol, and every payout in the game comes out of the bonus round.
Which makes the hit frequency mean something different here than it does anywhere else. It reads 3.03%, and since there are no small wins to count, that figure is not a measure of anything trickling in. It is the bonus trigger rate, full stop. About one spin in thirty-three opens a round. The other thirty-two return nothing whatsoever, and Evoplay publishes that number nowhere.
Fill the central row, three symbols straight across the middle, and the game switches on: three spins that reset to three every time a fresh symbol lands, coins carrying values, an octopus that sweeps the board. Small, dense, all or nothing. The 4,313x ceiling is real, and it lives entirely inside those rounds.
Theme & Design
The setting is a drowned temple, stone columns fading into blue water behind the reels, light shafts coming down from a surface you never see. A mermaid with dark red hair, a gold scallop-shell top and gold arm bracers floats to the left of the grid, her teal scaled tail ending in pink fins. On the right an oversized blue conch rests on the seabed venting a slow column of bubbles, with coral and pale rock strung along the bottom and the odd fish drifting past. The underwater art is good work.
Few symbols, all easy to read. Fat gold coins with a shell embossed on the face and the value stamped across in white. A wooden chest with a silver clam clasp and a blue pearl for the Mystic, a red and gold one with a golden seahorse for its jackpot variant. A purple octopus for the collector. Four jackpot panels run across the top in red, green, blue and magenta.
The weak spot is the grid itself. Empty cells are flat blue rectangles inside a thin gold frame, and because most spins land nothing, what you spend your time looking at is a large blue box. The art around the edges does work the reels should be sharing.
Symbols & Paytable
| Symbol | Payout |
|---|---|
| Bonus Coin | 1x, 2x, 3x or 4x total betvalue is stamped on the face when it lands |
| Sticky Coin | 5x to 9x total betstays on the reels between base spins until a bonus starts |
| Mystic | no value until it turnstransforms at the end of the round into any other symbol except the Sticky Coin |
| Mystic Jackpot | one of the four jackpot tiersguaranteed to hold a jackpot when it turns |
| Octopus | collects every value on the boardno value of its own, and it only takes what landed before it in the round |
| GRAND jackpot | 500x total bet |
| MAJOR jackpot | 50x total bet |
| MINOR jackpot | 20x total bet |
| MINI jackpot | 10x total bet |
Features & How They Work
The central row
Three symbols across the middle row of the 3x3 and the round begins. Everything on the board locks and you get three spins, resetting back to three each time another symbol lands, so a busy start keeps extending itself until the grid stops cooperating. Nine cells is not many, and rounds that fill every one of them are the ones that pay properly.
There are two versions. The Bonus Game is the standard one. The Ultra Bonus Game runs the same three-spin structure but guarantees Luck of Aurora from the opening spin and fires it more often after that.
Sticky Coins that wait for you
Sticky Coins carry 5x to 9x total bet and they do not disappear at the end of a base spin. They hold their position until a bonus round actually starts, which means the board accumulates while you are getting nothing. Land an 8x on spin four and a 7x on spin eleven and both are still sitting there when the middle row finally fills.
It is the one thing keeping the base game from being completely inert, and it changes what a dead board looks like.
The Octopus, and why order matters
The Octopus has no value of its own. What it does is collect every coin value and every jackpot from the Bonus symbols that appeared before it in the round, and that word before is the whole mechanic. An Octopus landing on the first spin of a round takes almost nothing. The same symbol on the last spin, after the board has loaded up, takes the lot.
Most collect games treat the collector as a straight sweep. Making it retroactive only, tied to sequence inside the round, gives each bonus a shape and a direction that similar games do not have.
Luck of Aurora
Luck of Aurora fires between one and nine water splashes into random cells, each one leaving an x2 multiplier stamped on the cell it hits. Repeat hits on the same cell stack the multiplier higher.
The important detail is that these attach to cells, not to symbols. A x8 built up in the bottom-left corner does nothing unless a coin lands in the bottom-left corner. So placement carries as much weight as value, and a round with big coins scattered across unmarked cells can look loaded and pay almost nothing. The Ultra Bonus Game exists mostly to get more of these on the board.
The buy menu points the opposite way to its successor
Two buys. The Bonus Game at 30x total bet and the Ultra Bonus Game at 75x. They do not return the same, and neither matches the base game: the 30x buy runs at 95.91%, six hundredths under the 95.97% base, while the 75x Ultra runs at 96.05%, eight hundredths over it. The expensive buy is the best-returning mode in the game and the cheap buy is the only mode that quietly costs you extra.
Worth spelling out, because the sequel does it backwards. In Olympus Gold Rush both buys land under its base game. Same engine, opposite answer, and nothing in either game says which way round it is. Take the 75x Ultra or spin normally. Leave the 30x alone.
Where the 4,313x actually comes from
The GRAND pays 500x against a 4,313x cap, so the top prize on that ladder is under 12% of what the game can do. Coins cannot bridge the rest on their own either. All nine cells filled at the top Sticky Coin value of 9x comes to 81x before a single multiplier touches it.
Which puts the ceiling almost entirely in Luck of Aurora, stacking x2s onto cells that already hold something worth multiplying. The jackpot ladder is the loudest thing above the reels and it is not where the money is.
One gap: the game never states how the GRAND is triggered. Its successor awards it for collecting symbols in every cell, so filling all nine is the likely route here, though that is read across from the sibling rather than confirmed by this one.
The same game, one column narrower
Fourteen months after this came out, Evoplay released Olympus Gold Rush, which is this engine with a fourth reel bolted on. Same collector-only design with no paytable, same sticky coins held between base spins, same Mystic transform rule, same three-spin resetting round, same randomly triggering Ultra, same cell multipliers.
What changed is narrower than you would think. Bonus Coins still run 1x to 4x and Sticky Coins still run 5x to 9x, identical in both games. The jackpots doubled at the top, 500x becoming 1,000x and 50x becoming 100x, while MINOR and MINI went up two and a half times. The grid gained three cells and the comet count scaled to match, one to twelve instead of one to nine. So Olympus is this game one column wider with the ladder raised and the coins left exactly where they were.
Reusing an engine is standard practice and there is nothing shabby about it. Still, these are the same game at two sizes, and this is the one that came first.
Screenshots
How Queen of Sirens Plays
Sessions run in two states with no middle ground. Most of the time the board sits empty and blue while you tap the button waiting for that centre row, and then it fills and everything happens at once.
The sticky coins are what stops the waiting being pure dead air. They hold position, so a board that looks like nothing is quietly loading, and watching a 9x sit in the corner for a dozen spins knowing it will be there when the round starts is a different kind of anticipation than a normal slot offers. Smart design. Whether it holds attention through thirty-odd blanks depends entirely on how patient you are.
Rounds are short and they read instantly (nine cells, all visible at once, no hunting for what landed where). They also have a direction, because the Octopus only takes what came before it, so you spend the round hoping it stays away until the board is worth sweeping. And the Ultra firing at random on a main-game spin is the only thing that ever surprises you here, which makes it comfortably the best moment the game has.
Pros & Cons
Pros
- Sticky Coins hold between base spins, so a dead-looking board is still building toward the round
- The Octopus collecting only what landed before it gives each bonus a shape most collect games lack
- Multipliers attach to cells rather than symbols, so where a coin drops matters as much as what it is worth
- The 75x Ultra buy returns more than the base game, which is rare
Cons
- Roughly one spin in thirty-three pays anything, and with no paytable at all the other thirty-two are completely dead
- The 30x Bonus Game buy returns less than the base game and nothing in the game tells you
- 95.97% is low for this studio
- Empty cells are plain blue panels and you look at a lot of them
Is Queen of Sirens Worth Playing?
A narrow game that knows exactly what it is. Nine cells, one row that matters, and a bonus round carrying the entire payout structure by itself. When it fires it is quick, readable and occasionally very good, and the sticky coins give the waiting a purpose that most hold-and-win base games never manage.
The cost of that design is steep. A 95.97% return is thin for Evoplay, the base game hands you nothing at all between rounds, and the jackpot ladder painted across the top turns out to account for barely a tenth of the ceiling. The wider sequel probably handles the same idea better, mostly because twelve cells give the multipliers more to bite on. This one got there first, though, and of the two buys only the Ultra is worth the money.
Frequently Asked Questions
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Reviewed by Arina, PR & Content Manager
PR & Content Manager at SlotsReach
Published 2 Aug 2026 · Updated 2 Aug 2026
