Hellcatraz is a 2020 online pokie from Relax Gaming, set in a cartoonish hell-prison inspired by Alcatraz with demonic inmates. Its most distinctive feature is the dual-mode play structure and a key-collection system that unlocks Super Free Spins. The default RTP is 96.46%, and the maximum win is 51,840x your stake.
Hellcatraz Pokie Review
Relax Gaming's 2020 high-volatility pokie offers 46,656 ways and a 51,840x max win.

The essentials
- Provider
- Relax Gaming
- RTP (default)
- 96.46%
- Volatility
- High
- Max win
- 51,840x
- Layout
- 6 reels, 6 rows
- Lines / ways
- 46,656 ways
- Bet range
- 0.10 – 25 (bigwinboard lists 20)
- Released
- 2020
Theme, studio and what makes the format different
Hellcatraz is a Relax Gaming title from 2020, set in a cartoonish hell-prison break inspired by Alcatraz, populated by demonic inmates. The visual style is deliberately exaggerated, fitting the prison-break premise.
The game uses a 6-reel, 6-row grid with 46,656 ways to win. That is a larger grid than the standard 5x3 layout, which increases the number of possible winning combinations. Wins are formed by matching symbols on adjacent reels, starting from the left.
What sets Hellcatraz apart structurally is the inclusion of two play modes: Mixed Mode and Lockdown Mode. These modes alter the behaviour of certain features, giving players a choice in how the game plays. The grid size and ways count are consistent across both modes.
Setting up a spin: stakes and controls
To play Hellcatraz, set your bet using the bet selector, which ranges from $0.10 to $25 per spin. The game uses a 6-reel, 6-row grid with 46,656 ways to win, meaning wins are paid for matching symbols on adjacent reels from the leftmost reel, regardless of position on the rows. The paytable and game info are accessible via the info button, where you can also check the RTP version. The spin button starts a round. You can choose between two modes: Mixed Mode and Lockdown Mode, which alter feature behaviour. A bonus buy option is available at 200x your bet, reduced by collected keys; this is a high-cost option best used when you want to skip the base game and have a sufficient bankroll.
RTP versions, variance and the top prize
The default RTP for Hellcatraz is 96.46%. There are three versions: Mixed Mode at 96.46%, Lockdown Mode at 96.30%, and a bonus buy option that raises the RTP to 96.88%. The difference between 96.46% and 96.30% is 0.16 percentage points, which equates to a theoretical loss of 16 cents per $100 wagered over the long term.
The maximum win is 51,840 times your stake. For example, a $0.10 bet could return up to $5,184, while a $25 bet could return up to $1,296,000. This is a high-volatility game, so wins are less frequent but larger when they occur.
Always check the RTP version in the game's info panel before playing, as it can vary by casino and mode.
Bankroll maths for Hellcatraz
Given the high volatility, your bankroll needs to absorb long dry spells. With a bet range of $0.10 to $25, a $50 session could support 500 spins at the minimum bet, but that is not realistic for high volatility. A more sensible approach is to bet $0.50 to $1 per spin, giving 50–100 spins for a $50 session. For a $200 session, you could afford $1–$2 bets, providing 100–200 spins.
The bonus buy costs 200x your bet, reduced by collected keys. That means a $0.10 bet would cost $20 to buy the bonus, while a $1 bet would cost $200. Buying the bonus is a high-cost option that can deplete a bankroll quickly.
No betting system changes the RTP; the house edge remains the same regardless of bet size.
Bonus features and how they trigger
Hellcatraz includes several key features:
- Cascading wins: Winning symbols disappear and new ones fall into place, allowing multiple wins from a single spin.
- Mystery Symbols: These appear with a countdown number. After each cascade, the countdown decreases, and when it reaches zero, the symbol reveals a random paying symbol.
- Key collector: Collect keys during the game. Once you have 2,000 keys, you unlock Super Free Spins.
- Super Free Spins: This mode features golden mystery symbols that award extra spins when revealed.
- Two play modes: Mixed Mode and Lockdown Mode, each with different rules for the features.
- Bonus buy: Pay 200x your bet to trigger the bonus round directly, with the cost reduced by collected keys.
For example, a cascade might start with a win, then new symbols fall, and a Mystery Symbol countdown reaches zero, revealing a high-paying symbol that creates another win, and so on.
Demo mode vs real money
The demo version of Hellcatraz uses play credits but operates with the same maths and RTP version as the real-money build at the casino you open it in. Given the high volatility, a demo session is useful for observing how often the cascading wins and Mystery Symbols trigger, and how the key collector progresses. You can also test how different bet sizes feel across the range, from $0.10 to $25, without financial risk. When playing with real AUD, bets are actual money, so bankroll limits matter more; the demo lets you practise without that pressure, but remember that outcomes are random and past results don't predict future ones.
Where to play for real money in Australia
You can play Hellcatraz at Crowncourt Pokies AU, Autumn Moon, which offers the game in AUD. A demo mode is available so you can try the game without risking real money. Before playing for real, check the RTP version offered at the casino, as it may differ from the default. Remember to play responsibly; for help, contact Gambling Help Online at 1800 858 858.
Verdict
Hellcatraz suits players who enjoy high-volatility games with complex features and a large ways system. The dual-mode choice adds variety, and the key-collection mechanic gives a long-term goal. However, the high volatility means it's not for those with small bankrolls or who prefer frequent small wins. The cartoonish theme may not appeal to everyone, but the mechanics are solid.
Alternatives on this site
Gates of Olympus — Both are high-volatility games with cascading wins and a 6-reel layout, though Gates of Olympus uses a 5x6 grid with scatter pays. Gates of Olympus has a lower max win of 5,000x and a simpler multiplier system, while Hellcatraz offers dual modes and a key collection mechanic.
Great Rhino Megaways — Shares high volatility and a 6-reel format with cascading wins (tumbles). Great Rhino Megaways uses a Megaways engine with variable rows and a progressive multiplier during free spins, while Hellcatraz has a fixed 6x6 grid and a key-based feature unlock. Max win differs: 20,000x vs 51,840x.
Wild West Gold — Both are high-volatility games from Pragmatic Play with a western theme, but Wild West Gold uses a 5x4 grid and has a max win of 6,750x. It features multiplier wilds and sticky wilds during free spins, whereas Hellcatraz offers cascades, Mystery Symbols, and dual modes.
FAQ
-
What is the maximum win in Hellcatraz?
The maximum win is 51,840 times your stake. For a $1 bet, that would be $51,840. This is a high-volatility game, so such wins are rare.
-
How do I unlock Super Free Spins?
You need to collect 2,000 keys. Keys are collected during gameplay, and once you reach that threshold, Super Free Spins are unlocked. These feature golden mystery symbols that award extra spins.
-
What is the difference between Mixed Mode and Lockdown Mode?
Mixed Mode has an RTP of 96.46%, while Lockdown Mode has 96.30%. The modes also affect how features like Mystery Symbols and cascades behave, so you can choose your preferred play style.
