Return to Player
96.83%
Minimum bet
0.10
Game type
Video Slots
Volatility
High
Reels
5
Progressive jackpot
No
Popularity
Maximum bet
25
Game Provider
Relax Gaming
Bonus features
Yes
Paylines
46.656
Theme
Alcatraz
Hellcatraz online slot game
Hellcatraz is an eighties-inspired video slot packed with colourful graphics and features. Choose between 2 game modes, uncover mystery symbols, collect rewards with cascading reels, gather keys to trigger free spins, or use the ‘buy feature’ option to purchase the bonus.
Theme and story line
Hellcatraz takes inspiration from the infamous Alcatraz prison for its 80s-style setting. Cops, inmates and prison guards appear on the reels, framed as a prison island in the USA.
Graphics, sounds, and animations
Relax Gaming gives Hellcatraz an intentionally eighties aesthetic, with fuzzy reels and graphics reminiscent of an old Spectrum computer from that era. The sunset backdrop looks across San Francisco’s skyline towards the Golden Gate Bridge. US police squad cars wail their sirens, while Hellcatraz prison ships bob on the city’s waters. Eighties-style animations and a bubbly theme tune round out the presentation.
Top Casinos to Play Hellcatraz:
Gameplay
Choose between 2 modes: ‘Mixed Mystery Symbols’ and ‘Lockdown Mystery Symbols’. Opening the game reveals a 6x6 grid, where wins form through cascading symbols. The layout offers 46,656 ways to win.
The aim is to connect any of the 9 regular symbols in groups of 3, 4, 5 or 6. The total spin-bet payouts for landing 6 symbols on a payline are listed below:
- Prison Guard - 2x
- Inmate - 1.2x
- Shark - 1x
- Guard Badge - 0.8x
- Handcuffs - 0.6x
- Playing Card Suits - 0.4x
A 10th symbol can land on reels 2-6. Marked ‘W’, this is Hellcatraz’s wild and substitutes for any of the regular symbols listed above.
Bonuses and free spins
Cascading Reels: Winning symbols burst off the reels before new ones fall into their places, potentially creating more combinations from a single spin.
Mystery Symbols: Mystery symbols appear in every game mode and during free spins. They show numbers and reveal a prize after a set number of cascades. The number serves as a counter; when it reaches 0, the symbol awards its mystery win.
Super Free Spins: Collect 2,000 keys to receive 5 spins. In free spins, Mystery symbols have no counter and reveal their prize as soon as they land on the reels.
Collecting Keys: Keys sit over regular symbols and award 1-10 when they appear. Several keys can land on the reels at once, sometimes giving 50 to 100 keys.
Feature Buy: You can purchase either ‘full feature free spins’ or ‘top-up’. The ‘full feature’ option adds 2,000 keys straight away, while ‘top-up’ increases your current key total to 2,000.
Mixed-mode Vs Lockdown Mystery Symbols: In mixed mode, mystery-symbol counters are set randomly from 1 to 5 at the start. In lockdown mode, every counter starts at 5, but the prizes revealed are larger.
Bet sizes, RTP and variance
The ‘$’ option sets Min-Max bets at 0.10-25.00. The ‘?’ menu displays the slot’s RTP: 96.46% in lockdown mode and 96.30% in mixed mode. ‘Feature Buy’ offers an RTP of 96.83%. Volatility differs by mode:
- Mixed Mystery Symbols – High Variance
- Lockdown Mystery Symbols – Super High Volatile
Conclusion
The original review highlights the combination of 2 game modes, a buy feature, mystery symbols, a free spins bonus trigger and cascading reels. These mechanics are not all new to video slots, but paired with Hellcatraz’s retro eighties look, they give the game a distinct character worth exploring.
Evan Carrington brings more than 12 years of experience in the iGaming industry, with a focus on reviewing online casinos, assessing slot games and examining player safety. Their work covers casino licensing, RTP, volatility, bonus terms and withdrawal policies. Drawing on practical testing and independent research, Evan provides clear, evidence-based reviews to help players understand gambling platforms, their features and possible risks.
