Know the numbers
Most players ask what RTP, volatility and the win cap mean for their own money.
| What it means | In numbers |
|---|---|
| Game provider | Pragmatic Play |
| RTP (return to player) | 96.52% / 96.54% |
| Volatility | High |
| Grid size | 7x7 |
| Max win multiple | x10,000 |
| Max win at highest bet | A$2,400,000 |
| Release date | 02/10/2025 |
Pick this slot if you want an ocean fantasy theme with mermaids and treasure on a 7x7 grid of 49 positions. Wins come from clusters rather than paylines. Five matching symbols is the fewest that pay, and they must touch horizontally or vertically. Diagonal contact does not count. The base game runs on these cluster rules before any feature starts.
Choose this slot for the way its features stack. Winning clusters vanish, scatters stay, and the rest of the grid falls and refills until no win remains. Scatters that land anywhere start a free spins round, and each extra scatter adds a spin. Multiplier Wild symbols stay on the grid for the whole round, starting at 1x.
Decide on a buy knowing it costs 100 times the total bet for Free Spins and 400 times for Super Free Spins.
| Bonus purchase | Cost | RTP |
|---|---|---|
| Buy Free Spins, Guaranteed Scatters | x100 · A$500 | – |
| Buy Super Free Spins | x400 · A$2,000 | – |
Check the return before the first spin: RTP is the share of staked money paid back over time, counted per A$100 staked. The version Igni Casino runs is listed in the game rules.
| Version | RTP | Factory setting |
|---|---|---|
| Variant 1 | 96.54% | Yes |
| Variant 2 | 96.52% | Nil |
Before you bet
Read this when you are deciding whether to spin, trigger or buy the bonus.
Keep spinning the base game until three, four, five, six or seven SCATTER symbols land on the grid. That awards 10, 12, 14, 16 or 18 spins. Each extra SCATTER during the round adds a spin. MULTIPLIER WILD symbols stay sticky for the round, starting at 1x.
Base game spinsUp to 18 spins
Compare the Super Free Spins price with the Free Spins price before you buy. It costs 400 times the total bet, or A$2,000 at the A$5 example bet, against 100 times for Free Spins.
Before buyingSuper Free Spins
Switch the Ante Bet on for more SCATTER symbols. Its price is 1.5 times the total bet, and it lifts the bet multiplier from 20x to 30x. While it is active, the toggle raises the natural Free Spins trigger chance and disables both buy buttons.
Before spinningMore SCATTER symbols
Choose Buy Free Spins to trigger the bonus instantly, for 100 times the total bet or A$500 at the A$5 example bet. The purchase guarantees three to seven SCATTER symbols on that spin. The award then follows the normal table, from 10 to 18 spins.
Waiting for SCATTERsInstant bonus spins
Mermaid's Treasure Trove
Shows the bonus screens and a win screen, so you know what to expect in play.
Round walkthrough
Shows what happens in each round, from choosing the bet to setting a session limit.
Choose a bet from A$0.20 up to A$240 before the first spin. The bet is the base for every win, and the maximum win is set as a multiple of it.
Count five or more matching symbols that touch horizontally or vertically on the 7x7 grid. Diagonal neighbours do not count, so a diagonal group does not pay.
Track each Scatter, because a tumble never removes it and it still counts toward Free Spins. The tumble repeats until no wins remain, and all its wins are summed.
Land three to seven Scatters anywhere on the grid to start Free Spins. Each extra Scatter adds a spin, and Multiplier Wild symbols stay sticky for the round.
Set a limit before the first spin and stop once you reach it. Nothing in a round shows how long the session will last or when the next bonus will come.
Set your session budget knowing that how often the bonus round comes is not known in advance. The result of one session is random whatever the RTP version, so an RTP figure describes the long-run return across many spins and does not promise how any single visit will end. Plan for a session that can end in a loss, whichever RTP version applies.
Open the game rules before you stake, because the RTP version Igni Casino runs is shown only there. This slot has two RTP versions, and the rules name the one in use, so read that line before you choose a bet.
Treat the maximum win of Mermaid's Treasure Trove as a ceiling reached very rarely, not as a target for any session. The cap is a multiple of the stake, so the money amount rises with the bet you choose, while the chance of reaching it cannot be known in advance.
Learn the rules
At Igni Casino, you see how a round works before any money leaves your account.
The demo needs no money and pays nothing. The real game needs an Igni Casino account and players aged 18 or older.
Start playingCompare before you play
Other titles reviewed here let you compare rules before choosing your next session.
Players must be 18 or older. Help in Australia: National Gambling Helpline on 1800 858 858. Self-exclude through BetStop, the national self-exclusion register.
Decide the most you can afford to lose on Mermaid's Treasure Trove before the first spin, and do not add to it during play.
Set your stopping point before the first spin and keep it after a win, since a big win can tempt more play.
Set deposit and loss limits on your account before playing, so the cap is fixed before any bet is placed.
Take a break or self-exclude through BetStop if the game stops being fun or your play feels out of control.
Know the rules
Short answers on bets, demo play, bonus buys, top win, RTP and volatility before the first spin.
Bets run from A$0.20 to A$240 per spin, which is the full range this game allows here. The examples on this page use A$0.40, A$0.50 and A$5, but they are not limits.
The paytable is set at A$0.40, so the money value of each symbol can be read before any stake goes in. Start at the lowest bet of A$0.20 if you want the smallest stake while learning the tumble and the free spins.
Buy Free Spins costs 100 times the total bet, and Super Free Spins costs 400 times. At the A$5 example bet, that is A$500 and A$2,000. The Ante Bet switches the buy buttons off while it is active.
The top win is 10,000 times the bet. At the A$5 example bet that is A$50,000, and at the A$240 maximum bet it reaches A$2,400,000. Reaching the top win depends on the spins, and no one can know in advance when that happens.
The game has two RTP versions, 96.52% and 96.54%. RTP is the long-run return per A$100 staked, so a single session can finish above or below it. The figure says nothing about the result of one spin.
The volatility of this game is high. High volatility means the wins are uneven: large wins are possible, but smaller wins may not arrive in every stretch of play. How often the bonus comes cannot be known in advance.
Senior editor, former responsible gambling adviser
I write and check every verification step a player meets, from documents to first withdrawal, and I work through each bonus term and its wagering myself before publication.
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