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-style video slot with colorful graphics and a range of features. Choose between 2 game modes, uncover mystery symbols, collect rewards with cascading reels, trigger free spins by collecting keys, or use the ‘buy feature’ option to purchase the bonus.
Theme and Story
Hellcatraz takes inspiration from the notorious Alcatraz prison for its 80s-style setting. Cops, inmates, and prison guards appear across the reels, set on a prison island in the USA.
Graphics, Sound, and Animation
Relax Gaming gives Hellcatraz an intentionally eighties look, with fuzzy reels and graphics reminiscent of an old Spectrum computer from that era. The sunset scene looks across San Francisco's skyline toward the Golden Gate Bridge. US police squad cars blare their sirens as 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’. The reels open on a 6x6 grid where wins form through cascading symbols. The layout offers 46,656 ways to win.
The aim is to match any of the 9 regular symbols in groups of 3, 4, 5, or 6. The listed total payouts, as multiples of the spin bet, for landing 6 symbols on a payline are:
- 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. This is Hellcatraz's Wild, marked ‘W’, and it substitutes for any of the regular symbols listed above.
Bonuses and free spins
Cascading Reels: Winning symbols burst off the reels before new ones drop into their places, creating the possibility of more combinations from a single spin.
Mystery Symbols: Mystery symbols can 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. During 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 land in view. Multiple keys can appear on the reels together, sometimes yielding 50 to 100 keys.
Feature Buy: Players can purchase either ‘full feature free spins’ or ‘top-up’. The ‘full feature’ option immediately adds 2,000 keys, while ‘top-up’ raises 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 volatility
The ‘$’ option sets Min-Max bets of 0.10-25.00. The ‘?’ menu lists the slot's RTP: 96.46% for lockdown mode and 96.30% for mixed mode. Using ‘Feature Buy’ gives an RTP of 96.83%. Volatility depends on the selected mode:
- Mixed Mystery Symbols – High Volatility
- Lockdown Mystery Symbols – Super High Volatility
Conclusion
Al Buraq Regina highlights the 2 game modes, feature buy, mystery symbols, free spins bonus trigger, and cascading reels as an especially varied feature mix. These mechanics are not all new to video slots, but their combination with Hellcatraz's retro eighties design gives the game a distinctive character worth exploring.
Evan Carrington brings more than 12 years of experience in the iGaming industry, specializing in online casino reviews, slot game analysis, and player safety assessments. Their expertise includes casino licensing, RTP, volatility, bonus terms, and withdrawal policies. Combining hands-on reviews with independent research, Evan provides clear, evidence-based coverage to help players understand gambling platforms, their features, and possible risks.
