Red TigerRed Tiger

    Pirates Plenty The Sunken Treasure

    8.4/10
    Release February 2019· Updated August 2026

    Official RTP of 95.70%, a 4,359x ceiling and a 32.98% hit frequency: here the sixth reel unlocks, and once open it stays open.

    RTP
    95.7%
    Volatility
    High
    Max Win
    4 359x
    Grid
    5x3 grid, expanding to 6x3
    Bonus Buy
    No
    Map piece collection unlocking a 6th reelPermanent unlockWild ships with 2x / 3x / 5x multipliersWild monkey removing low symbolsOcean Spins: 10 free spinsTreasure chest keys converting symbols to wilds
    Pirates Plenty The Sunken Treasure
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    BetsRank Verdict

    Hands-on testing by Alexandre Dubois — bonus tested, multiple sessions

    This game has an idea few machines have: permanent progression. You collect map pieces to open a sixth reel, and once open, Red Tiger states it stays open. The wild ships carrying 2x, 3x and 5x multipliers only appear after that unlock. A player arriving at the machine is therefore not playing the same game as one who has done the work. That is a genuine design idea, and also a trap: until the reel is open you are playing a stripped-down version at 95.70% RTP. The data on this title is otherwise the most incoherent of our Red Tiger batch. The official page quotes a 4,359x maximum win and a 27 February 2019 release; SlotCatalog quotes 5,000x and 15 November 2018. The official RTP is 95.70%, yet SpinHunter records legacy variants at 94.66%, 92.73% and 90.67%. At 90.67%, house margin rises to £9.33 per £100 staked, more than double the official setting. This is a sheet that demands checking before you play.

    Strengths

    • +Persistent progression: the sixth reel does not close again
    • +32.98% hit frequency, high for a 20-payline game
    • +Wild ships carrying multipliers up to 5x after the unlock
    • +Accessible stakes from £0.10 per spin on the official build
    • +Three episodes in the series, running from 4,359x to 22,640x

    To consider

    • Half the upside is locked until reel six is opened
    • RTP variants recorded at 94.66%, 92.73% and 90.67% by SpinHunter
    • Disputed maximum win: 4,359x official against 5,000x at SlotCatalog
    • Three months between the release dates given by the sources
    • Only ten free spins, with no announced progressive multiplier

    About Pirates Plenty The Sunken Treasure

    Pirates' Plenty: The Sunken Treasure starts on a 5-reel, 3-row grid with 20 fixed paylines, but that is not its final configuration. First thing worth flagging: Red Tiger publishes this game simply as Pirates Plenty on its product page, while the databases append the subtitle The Sunken Treasure. Both sequels in the series, Battle for Gold and Treasures of the Seas, do carry their subtitles on the publisher's site.

    The structuring mechanic is map piece collection. The player accumulates map symbols across spins and, once the bar fills, a sixth reel opens: the grid goes from 5x3 to 6x3, from 15 to 18 positions. Red Tiger specifies that this reel stays unlocked once obtained. It is persistent progression, which is rare on a payline machine.

    That unlock is not cosmetic. The wild ships carrying multipliers of 2x, 3x or 5x only appear after the sixth reel opens. In other words, half the game's upside sits behind a progression condition, and a player discovering the title is mechanically playing a poorer version than the one the paytables describe.

    Two further features complete the set. The wild monkey appears in the normal game, removes low-value symbols from the grid and stays positioned where the last removed symbol sat. Ocean Spins trigger on three dedicated symbols and award 10 free spins; during that phase, treasure chest keys turn low-value symbols into wilds.

    The RTP is the black mark on this sheet. Red Tiger's official page shows 95.70%, leaving £4.30 of house margin per £100 staked. SlotCatalog lists 95.07%, or £4.93. But SpinHunter above all records legacy variants reported at 94.66%, 92.73% and 90.67%. Those last two are substantial: at 90.67% the house keeps £9.33 per £100 staked, more than double the £4.30 of the official setting. They sit in the same band as the builds connected to the Daily Drop jackpots, which SlotCatalog places at 91% or 93% base RTP. We cannot assert they are the same configurations, but the order of magnitude matches.

    Red Tiger publishes a hit frequency of 32.98%: roughly one spin in 3.03 returns something. That is well above the studio's older payline games — 20.27% on Lucky Halloween, 21.64% on Persian Fortune — but below its grid games (36% on Vault of Anubis, 37.63% on Piggy Riches Megaways).

    The maximum win is disputed too. Red Tiger quotes 4,359x, SlotCatalog 5,000x. At official stakes of £0.10 to £50, 4,359x is £435.90 at the minimum, £4,359 at £1 and £217,950 at £50. In the United Kingdom, where online slot stakes are capped at £5 for players 25 and over and £2 for 18-24s, that same ceiling is worth only £21,795 and £8,718 respectively. Across the series, the official pages place Battle for Gold at 5,501x and Treasures of the Seas at 22,640x: the escalation from episode to episode is clear.

    Release dates diverge as well: 27 February 2019 on the official page, 15 November 2018 at SlotCatalog, more than three months apart. No source documents a bonus buy on this title.

    Key mechanics

    • 5x3 grid with 20 fixed paylines, expanding to 6x3
    • Map piece collection to open a sixth reel
    • The sixth reel stays unlocked once obtained, per Red Tiger
    • Wild ships with 2x, 3x or 5x multipliers, only after the unlock
    • Wild monkey removing low-value symbols in the base game
    • Ocean Spins: 10 free spins from three dedicated symbols
    • Treasure chest keys turning low symbols into wilds
    • Official RTP of 95.70%, or £4.30 house margin per £100 staked
    • 32.98% hit frequency, roughly one paying spin in 3.03
    • Maximum win of 4,359x per Red Tiger, 5,000x per SlotCatalog

    Pirates Plenty The Sunken Treasure FAQ

    How do you unlock the sixth reel?

    By collecting treasure map symbols across spins.

    Once the collection is complete, the extra reel opens and the grid goes from 5x3 to 6x3, from 15 to 18 positions. Red Tiger specifies it stays unlocked afterwards.

    What does the sixth reel actually change?

    It adds three positions, but above all it gates the wild ships carrying 2x, 3x and 5x multipliers, which do not appear before it.

    A meaningful share of the game's upside is therefore inaccessible until the collection is finished.

    What is the official RTP of Pirates' Plenty?

    Red Tiger's product page shows 95.

    70%, leaving £4. 30 of house margin per £100 staked. SlotCatalog lists 95. 07%, or £4. 93. We keep the publisher's figure.

    Are there lower-RTP builds?

    SpinHunter records legacy variants reported at 94.

    66%, 92. 73% and 90. 67%. At 90. 67% the house keeps £9. 33 per £100 staked, more than double the official setting. Check the paytable at your own casino.

    Are those low RTPs linked to the Daily Drop jackpots?

    We cannot assert it.

    SlotCatalog states that Red Tiger builds connected to the Daily Drop network run at 91% or 93% base RTP. The recorded 92. 73% and 90. 67% sit in the same band, without the link being established.

    What does the wild monkey do?

    It appears during normal spins, removes low-value symbols from the grid and stays positioned where the last removed symbol sat.

    It is a clearing feature, increasing the density of premium symbols across the paylines.

    How many free spins do Ocean Spins award?

    Ten, triggered by three dedicated symbols.

    During that phase, treasure chest keys convert low-value symbols into wilds. No progressive multiplier is announced for this feature.

    What is the real maximum win?

    Red Tiger quotes 4,359x on its official page, SlotCatalog 5,000x.

    We keep the publisher's figure. At 4,359x that is £435. 90 at £0. 10, £4,359 at £1 and £217,950 at the £50 maximum stake.

    What is the ceiling worth in the United Kingdom?

    Online slot stakes there are capped at £5 for players 25 and over and £2 for 18-24s.

    The 4,359x ceiling is therefore worth only £21,795 in the first case and £8,718 in the second.

    Why does the game's name vary across sites?

    Red Tiger publishes this title simply as Pirates Plenty on its product page, while databases append the subtitle The Sunken Treasure.

    Both sequels, Battle for Gold and Treasures of the Seas, do carry their subtitles at the publisher.

    Can you buy the free spins?

    None of the sources consulted documents a bonus buy on this title, neither price nor availability.

    The game therefore falls outside the feature buy bans applied in the United Kingdom and several other regulated markets.

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    Last updated: 8/9/2026

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    Slot sheet last updated on · Sources: slotcatalog.com, official provider sites, BetsRank hands-on testing