Gold of Sirens Bonus Buy Slot Review
by EvoplayReleased Oct 19, 2021
Free demo - play instantly in your browser
Underwater mythology slot with Wild Replace free spins and a Hold & Win jackpot game. Fill all 15 positions for the 3,000x Epic Jackpot, with 6,119x total max win.

Specifications
| Game Type | Slots |
|---|---|
| RTP | 96.18% |
| Volatility | High |
| Max Win | 6,119x |
| Grid | 5x3 |
| Paylines | 20 fixed paylines |
| Min Bet | $0.1 |
| Max Bet | $75 |
Gold of Sirens Bonus Buy Slot Overview
This is the buy-button edition of Evoplay's siren slot, and the buy menu is the whole reason it exists. Underneath, it is the same game as Gold of Sirens from four months earlier: 5 reels, 3 rows, 20 fixed lines, free spins that flip a random low-paying symbol to Wild, and a hold-and-win round chasing an EPIC 3,000x. The base review has the mechanics in full. This one is about the shop.
Four things are for sale. Eight free spins for 40x total bet, ten for 50x, twelve for 60x, and the Jackpot game for 34x. The free spins pricing is arithmetic rather than design: exactly 5x total bet per spin across all three tiers, and all three return the same 96.10%. Twelve spins is the eight-spin purchase bought one and a half times, priced to match, with no discount for volume and no premium either. The tiers differ in variance and in nothing else, which is a strange sort of menu.
The prices are fair. What sits behind the cheapest button is not.
Theme & Design
The reels hang inside a sunken temple, framed by a carved stone pediment and lit by pale shafts falling from somewhere far above. Two huge siren silhouettes flank the grid, half transparent, tails curling down past broken marble columns and clumps of pink and red coral. Poseidon presides over the whole thing, white bearded and glowering under a trident crown, a blue lightning bolt on his chest and a small orange jellyfish balanced on one open palm.
The symbols split cleanly in two. Four siren portraits sit in dark framed tiles, silver, red, teal and purple haired, all painted in the same soft light and honestly a bit hard to tell apart mid-spin. Below them drift jellyfish in blue, green, pink and orange, and the Jackpot coins are gold discs with an octopus pressed into the face and a value stamped over it. The Scatter is a gilded frame around two sirens tangled together above a bed of coral.
Three meters run across the pediment reading MAJOR 500, EPIC 30000 and MINOR 200. Those are cash figures at the stake you are playing, not multipliers. At the default 10.00 bet the EPIC shows 30000 because it pays 3,000x, and that readout is where the wrong 30,000x max win figure floating around comes from. The ceiling is 6,119x total bet.
Symbols & Paytable
| Symbol | Payout |
|---|---|
| Wild | 2x / 5x / 50x for 3/4/5substitutes everything except Scatter and Jackpot, lands on any reel, and is the top payer in its own right |
| Siren, first premium | 1.5x / 3.5x / 40x for 3/4/5 |
| Siren, second premium | 1.2x / 3x / 30x for 3/4/5 |
| Siren, third premium | 1x / 2.5x / 25x for 3/4/5 |
| Siren, fourth premium | 1x / 2x / 20x for 3/4/5 |
| Jellyfish, top low-pay | 0.5x / 1x / 10x for 3/4/5the four jellyfish are the pool Wild Replace draws from in free spins |
| Jellyfish, second low-pay | 0.3x / 0.8x / 8x for 3/4/5 |
| Jellyfish, third low-pay | 0.2x / 0.7x / 5x for 3/4/5 |
| Jellyfish, lowest | 0.1x / 0.5x / 3x for 3/4/5 |
| Scatter | 8 / 10 / 12 free spins for 3/4/5lands on any reel, and each one during the round adds a single extra spin |
| Jackpot coin | 1x to 10x bet, MINOR 20x, MAJOR 50xno line pays; six or more start the Jackpot game, and all 15 add the EPIC 3,000x |
Features & How They Work
Free Spins and the Wild Replace
Three, four or five Scatters award 8, 10 or 12 free spins. The round runs on one idea and it is a good one: every single spin, the game picks one low-paying symbol type at random and turns every copy of it on the reels Wild for that spin only. When the chosen jellyfish happens to be sitting in five positions, the grid rebuilds itself into something silly. When it landed twice, the spin is just a spin. Scatters keep working inside the round and each adds one more.
The Jackpot game
Six or more Jackpot coins on a single spin start a hold and win round with three respins. Coins lock in place, only coins land, and any new one puts the counter back to three. It runs until the respins are gone or all 15 positions are full. Regular coins carry 1x to 10x the bet, MINOR pays 20x, MAJOR 50x, and a full grid adds the EPIC 3,000x. Everything is summed at the end and paid in one go.
Buying the free spins
A gold-edged BONUS BUY tab is clipped to the left of the reels, and it opens a four-option shop. Eight free spins cost 40x total bet, ten cost 50x, twelve cost 60x. The purchase round spins the Scatters in and the free spins start immediately at the stake used for the buy. All three tiers return 96.10%, so choosing between them is not a value decision, only a decision about how much variance to take in one sitting. The 60x button is the 40x button with a bigger appetite.
Buying the Jackpot game: one respin, not three
At 34x total bet this is the cheapest thing on the menu, and it is cheap because it is not the same round. A naturally triggered Jackpot game opens with three respins. The bought one opens with one. So the round dies almost as fast as it starts unless that single respin brings in another coin and puts the counter back up, at which point it behaves like the normal version. Anyone paying 34x expecting the round they have watched trigger organically is getting something materially weaker for their money. It is also the only way to pay your way toward the EPIC 3,000x, which means the headline prize in this game is sold on the worst terms in the shop.
Every button on the menu costs RTP
Base play returns 96.18%. The three free spins buys return 96.10% and the Jackpot buy 96.08%. Eight and ten hundredths of a percent is small, and nobody is going to feel it inside one session, but the direction is worth knowing: pressing buy here always hands a sliver back to the house. Evoplay does not always do this. Goddess of the Night Bonus Buy prices its purchases so that every option matches base RTP exactly, with no charge at all for skipping the wait. Same studio, different call. The shop only opens in the main game, and some markets have it switched off entirely.
Screenshots

How Gold of Sirens Bonus Buy Plays
The base game is a slow burner, and the tab on the left changes the shape of a session completely. Left alone, spins tick over on small jellyfish lines with the meters glowing overhead and long stretches where nothing lands, which is the usual high-volatility wait. Used, the session stops being a grind and turns into a run of 34x to 60x decisions, one after another. A bankroll that would have lasted two hours is gone in twenty minutes.
The free spins buys hold up better than the price band suggests, because Wild Replace has a high ceiling. Twelve spins at 60x needs 5x total bet per spin just to get level, which sounds brutal until one Replace spin covers a third of the reels and pays four lines at once. The flip side is spins that whiff completely, and in an eight-spin buy a single dead spin is an eighth of what was paid for.
The Jackpot buys are the ones that sting. They are fast, they are cheap, and most of them are over in about ten seconds. The loop that makes this round fun, coin, reset, coin, reset, needs something on that first respin to even begin, and with only one on the clock it usually never gets going. It probably suits someone who wants a quick lottery ticket and knows what they are buying. It does not suit anyone who liked how the natural round feels.
Pros & Cons
Pros
- Buy prices sit in a normal band and the free spins tiers are priced honestly at a flat 5x total bet per spin
- 96.18% base RTP is strong for the era, and playing without buying keeps all of it
- Wild Replace converts an entire symbol type every free spin, which gives the round a high ceiling
- The Jackpot buy is the only route to the EPIC 3,000x that does not involve waiting for six coins
Cons
- The bought Jackpot game starts with one respin instead of three, so most rounds end almost immediately
- Every purchase returns less than base play, unlike Goddess of the Night Bonus Buy where the buys are RTP neutral
- The three free spins tiers carry identical RTP, so the choice between them comes down to variance alone
- Nothing here is new beyond the shop; the game underneath is unchanged
Is Gold of Sirens Bonus Buy Worth Playing?
The shop is priced sensibly and the game beneath it is good. 96.18% is a strong base number for 2021, the sirens are nicely painted, and Wild Replace is one of the better free spins ideas Evoplay has put its name to. Someone who wants the Jackpot round without sitting through the wait for six coins has exactly one way to get there, and this is it.
But the one thing this edition adds is also where it falls down. Three free spins tiers that are mathematically the same purchase, a small charge on every button, and a 34x Jackpot buy that hands over a third of the respins the real round starts with. The cheapest option is the one to treat with the most suspicion, and it is dressed up as the bargain. The base version keeps the fractionally better math and loses nothing except the button.
Frequently Asked Questions
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Reviewed by Arina, PR & Content Manager
PR & Content Manager at SlotsReach
Published 1 Aug 2026 · Updated 1 Aug 2026