Relax GamingRelax Gaming

    Hellcatraz

    9.3/10
    Release May 2020· Updated June 2026

    Cluster-pays slot from Relax Gaming (May 2020). Countdown mystery symbols + Mixed/Lockdown modes, max 51,840x. BetsRank score: 9.3/10.

    RTP
    96.46%
    Volatility
    High
    Max Win
    51 840x
    Grid
    6x6
    Bonus Buy
    Yes
    Cluster pays cascadingCountdown mystery symbols (1-5)2 modes : Mixed / LockdownFree Spins (collect 2 000 keys)Achat bonus 200x
    Hellcatraz
    🎰

    Where to play Hellcatraz — Top 3 casinos

    Casinos recommended by Alexandre Dubois — RTP intact, generous bonuses, fast withdrawals.

    #1
    9.3
    WinKingdom

    WinKingdom

    See full review →

    🎁 Pack 4 deposits up to €15,000 + 450 TG

    Wagering: x40
    Play at WinKingdom
    #2
    9.5
    Vave

    Vave

    See full review →

    🎁 Pack 4 deposits up to 4 BTC + 100 FS

    Wagering: x50
    Play at Vave
    #3
    8.8
    Casino Peaches

    Casino Peaches

    See full review →

    🎁 Pack 3 deposits up to €1,000 + Free Spins

    Wagering: x40
    Play at Casino Peaches
    9.3

    BetsRank Verdict

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

    Released on 5 May 2020, Hellcatraz is one of Relax Gaming's most innovative cluster-pays slots. Format 6x6 cluster pays, up to 46,656 ways, RTP 96.46% (Mixed Mode) / 96.30% (Lockdown Mode) / 96.88% with bonus buy, high volatility, max win 51,840x. Its unique signature mechanic is Countdown mystery symbols (numbered 1-5) that tick down with every winning cascade and reveal a symbol when they hit 0. Two game modes are available: Mixed (high volatility) and Lockdown (super-high volatility, progressive multipliers). Free Spins trigger by collecting 2,000 keys via the cascades. Bonus buy costs 200x the stake. Hit frequency ranges from 19.92% (Lockdown) to 23.22% (Mixed).

    Strengths

    • +Unique Countdown mystery symbols mechanic
    • +Two game modes (Mixed / Lockdown)
    • +96.88% RTP with bonus buy
    • +46,656 ways cluster pays
    • +Decent 51,840x max win

    To consider

    • −200x bonus buy price is steep next to Money Train 4's 100x
    • −Free Spins are hard to reach (collect 2,000 keys)
    • −High to super-high (Lockdown) volatility
    • −Dark prison theme is a niche fit

    About Hellcatraz

    Released on 5 May 2020, Hellcatraz is one of Relax Gaming's most innovative cluster-pays slots. Format 6x6 cluster pays, up to 46,656 ways, RTP 96.46% Mixed Mode / 96.30% Lockdown Mode / 96.88% with bonus buy, high volatility (super-high in Lockdown), max win 51,840x. Dark prison setting. Its unique signature mechanic: Countdown mystery symbols (numbered 1-5) that tick down with every winning cascade and reveal a symbol when they hit 0. Two selectable game modes: Mixed (high volatility, 23.22% hit rate) or Lockdown (super-high volatility, progressive multipliers, 19.92% hit rate). Free Spins trigger by collecting 2,000 keys through the cascades — a rare and lengthy grind. Bonus buy costs 200x the stake.

    Key mechanics

    • ▸6x6 cluster-pays format, 46,656 ways
    • ▸Countdown mystery symbols (1-5)
    • ▸Two modes: Mixed / Lockdown
    • ▸Cascading wins
    • ▸Free Spins (collect 2,000 keys)
    • ▸200x stake bonus buy
    • ▸96.88% RTP with bonus buy
    💰 Bonus Buy: 200x stake

    ❓Hellcatraz FAQ

    What's the RTP of Hellcatraz?▾

    Mixed Mode: 96.

    46%. Lockdown Mode: 96. 30%. With bonus buy: 96. 88%. Check the in-game 'i' menu to confirm.

    Mixed or Lockdown — which mode should I pick?▾

    Mixed (96.

    46% RTP, 23. 22% hit rate) is high volatility with longer, more comfortable sessions. Lockdown (96. 30% RTP, 19. 92% hit rate) is super-high volatility with progressive multipliers, aimed at chasing the big win. With a modest bankroll, Mixed is the safer pick.

    Is Hellcatraz available online?▾

    Yes, at most top-rated crypto and anonymous online casinos that carry Relax Gaming.

    What's the max win on Hellcatraz?▾

    The theoretical max win is 51,840x the stake, reached by chaining large cluster cascades with Countdown mystery symbol payouts, particularly in Lockdown mode.

    Similar slots to discover

    Money Train 4

    Money Train 4

    9.7
    Relax GamingView
    Money Train 3

    Money Train 3

    9.5
    Relax GamingView
    Money Train 2

    Money Train 2

    9.4
    Relax GamingView
    Try the official demo on Relax Gaming's site
    Alexandre Dubois
    Alexandre Dubois

    Online Casino & Bonus Expert

    Last updated: 6/27/2026

    Learn more →

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