PG SoftPG Soft

    Mermaid Riches

    8.4/10
    Release October 2021· Updated August 2026

    Underwater slot by PG Soft (October 2021). Pyramid grid that flips in free spins, x10 multiplier, 20,000x advertised. BetsRank score: 8.4/10.

    RTP
    96.71%
    Volatility
    Medium
    Max Win
    20 000x
    Grid
    1-2-3-4-5 (flipped to 5-4-3-2-1 in free spins)
    Bonus Buy
    No
    Grille inversée en free spins (Reelset Changing)Cascades avec multiplicateur x1→x5 (x2→x10 en bonus)Wild perle mobile à chaque spinWilds à compteur 1 à 3 utilisations
    Mermaid Riches
    Play Mermaid Riches at SlotLairPG Soft publishes no official demo · verified partner casino
    🎰

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    8.4

    BetsRank Verdict

    Our read of the game, based on the data the studio publishes

    Released on 1 October 2021 (after an exclusivity window in late August), Mermaid Riches is one of PG Soft's cleverest titles mechanically. The grid adopts a pyramid 1-2-3-4-5 layout for 120 ways to win and — here is the twist — flips to 5-4-3-2-1 during the free spins. RTP 96.71% (main game 75.01%, free spins 21.70%), medium volatility. The engine combines cascades with a multiplier climbing x1 → x2 → x3 → x5 in base play, doubled in the bonus (x2 → x10) and, crucially, never reset between spins. Two wild types: the golden oyster pearl, which repositions on every paid spin, and count-down wilds (1 to 3 uses). On the potential, stay clear-eyed: 20,000x advertised against 3,513x in simulation over one billion spins.

    Strengths

    • +Grid flips during free spins — a genuinely unique mechanic
    • +Multiplier doubled in the bonus (x2 to x10) and never reset
    • +75.01% of the RTP in the base game: lively non-bonus sessions
    • +Two complementary wild systems (roaming pearl + count-down)

    To consider

    • −Large gap between advertised (20,000x) and simulated (3,513x)
    • −Maximum bet capped at just €20
    • −No bonus buy
    • −Only 21.70% of the RTP sits in the free spins

    About Mermaid Riches

    Released as an exclusive on 27 August 2021 and then widely on 1 October 2021, Mermaid Riches is probably the most inventive PG Soft title of its generation in mechanical terms. The grid is not rectangular: it takes a pyramid 1-2-3-4-5 shape (one symbol on the first reel, two on the second, and so on) for a total of 120 ways to win. The game's twist arrives in the bonus: the grid flips entirely to 5-4-3-2-1 during the free spins, which completely changes the geometry of the combinations. RTP is 96.71%, with an atypical and rather favourable split: 75.01% in the base game against only 21.70% in the free spins — so non-bonus sessions stay considerably livelier than the catalogue average. Medium volatility. The engine rests on cascades paired with a progressive multiplier: in base play it climbs x1 → x2 → x3 → x5 across successive cascades; in free spins all those values are doubled (x2 → x10 after three cascades) and, decisively, the multiplier is not reset between free spins. The bonus round opens on at least 3 mermaid scatters, awards 8 free spins with +2 spins per additional scatter, and retriggers on 3 fresh scatters. Two wild systems coexist: the golden oyster pearl, which moves to a random position on every paid spin and stays frozen through the cascade sequence, and count-down wilds numbered 1 to 3, showing how many more wins they can take part in before disappearing. On maximum potential, transparency is required: PG Soft advertises 20,000x your stake, but the reference simulations over one billion spins top out at 3,513x. That is a factor of five and a half — the advertised ceiling remains theoretically reachable, but it should not be your yardstick for sizing a session. Finally, the maximum bet is capped at €20 and no bonus buy is available.

    Key mechanics

    • ▸Pyramid 1-2-3-4-5 grid, 120 ways to win
    • ▸Grid flips to 5-4-3-2-1 during the free spins
    • ▸Cascades: multiplier x1→x5 in base, x2→x10 in bonus with no reset
    • ▸8 free spins on 3 scatters, +2 per additional scatter
    • ▸Roaming pearl wild + count-down wilds with 1 to 3 uses

    ❓Mermaid Riches FAQ

    What is the RTP of Mermaid Riches?▾

    Official RTP: 96.

    71%, split into 75. 01% for the main game and 21. 70% for the free spins. That heavily base-game-weighted split makes non-bonus sessions steadier than on most PG Soft titles.

    Why does the Mermaid Riches grid change in free spins?▾

    That is the game's signature mechanic: the base game's pyramid 1-2-3-4-5 grid flips to 5-4-3-2-1 during the bonus round.

    The geometry of the 120 ways to win changes with it, favouring different combinations.

    What is the real max win on Mermaid Riches?▾

    PG Soft advertises 20,000x your stake, but the industry's reference simulations over one billion spins top out at 3,513x.

    The advertised ceiling remains the engine's theoretical maximum; the second figure better reflects what is actually observed.

    How does the Mermaid Riches multiplier climb?▾

    Through cascades.

    In base play it progresses x1 → x2 → x3 → x5 across successive cascades. In free spins all values are doubled (x2 → x10 after three cascades) and the multiplier is not reset between free spins.

    Which casinos offer Mermaid Riches?▾

    Mermaid Riches is available at the casinos in our panel that carry PG Soft, such as CosmoBet and Lussurio.

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    Slot sheet last updated on · Sources: slotcatalog.com, official studio sites