The Hellcatraz online slot is a retro-style game set in San Francisco Bay, where the island of Alcatraz holds guards, prisoners, sharks, and other symbols. This is a six-reel, six-row slot where you have 46,656 ways to win. Cascading reels unlock mystery symbols that transform into paying icons at the end.

The Hellcatraz slot is not short on bonus features as it comes packed with its Mystery Reveal mode, Super Free Spins as well as Bonus Buy and Key Collector bonuses which deliver impressive maximum winnings that go up to 51,840x players’ stake. The game is packed with 6 reels and 6 rows that feature 46,656 paylines. There are certain times when a dated design is no longer a bad thing, and an 8-bit style slot machine is one of those. We’re looking at Hellcatraz, released on, which stands on the grounds of high volatility and big payouts, along with a theme which is inspired by the toughest prison to escape from, the famous Alcatraz.

Bonus Features in Hellcatraz

It’s not just the design in the Hellcatraz slot that’s a little unusual. The gameplay is too, starting with the game engine. You’ll also see cascading reels which can in turn reveal special mystery symbols. There’s also a free spins round which, once again, is triggered in an unorthodox manner. We’ll start by looking at the game engine set up.

Cascading Reels feature

A winning combination results in a cascade where the successful symbols are removed and new ones replace them. The cascades keep on coming until no more new wins are formed.

Mystery Reveal feature

Mystery symbols which appear in the form of a number can land on any spin. With each cascade, their number drops by 1. When it reaches 0, the mystery symbol is revealed.

At the start of the game you’ll have the option of picking Lockdown Mode or Mixed Mode. In the former, all the Mystery Symbols have the same number. Choose the latter and there are independent counter numbers in play.

Super Free Spins feature

You’ll see keys appear overlaid on top of standard symbols. These can award between 1 and 10 keys. After any keys have been collected, the symbols act as normal. Instead of landing scatter or bonus symbols, collecting keys is how you trigger the main feature in Hellcatraz.

The Super Free Spins feature is activated once you have collected 2,000 keys. You begin with 5 free spins. The Mystery Symbols are active in the bonus round. You don’t need to land successive cascades to open them during the free spins though.

Also joining the action during the free spins round are Golden Mystery Symbols. If there are 2 of these on the reels and you go on to land 2 or more cascades, you’ll get 2 more free spins added to your total.

Buy feature

There are a couple of options here. You can pay 200 x your total stake and buy the Super Free Spins feature directly. This doesn’t have any effect on how many keys you have collected. They remain the same and you’ll start adding to the same number when the free spins are over.

Alternatively, you can use up the keys you have already collected and then top up by paying extra. The amount you have to pay varies depending on how many keys you have already collected. The Buy feature isn’t available in the UK due to regulations by the UK Gambling Commission.

Hellcatraz Slot RTP, Details and Wager Limits

The Hellcatraz slot is played using a 6x6 grid. Winning combinations are formed by landing matching symbols on adjoining reels, starting from reel 1. There are 46,656 ways to land a winner. And no, it's not a Megaways slot.

You can play Hellcatraz at stake levels that start at just 10p per spin. This rises to a maximum of £25 per spin for the Harry Grout-style Mr Bigs if the world.

The RTP is a reasonable 96.46%. This rises to an even better 96.83% if you opt to buy the feature. The Hellcatraz volatility is exceedingly high. This is a super high variance slot. We’re in 10 out of 10 territory on the volatility stakes. You can expect some length spells where your jail escape plans come to nought. The free spins round can really get the action going though.

The max win is a whopping 51,843.3 times your total stake though. The chances of winning big increase in the Super Free Spins feature. The hit frequency is 19.92% meaning just 1 in 5 spins will result in a winning combination.

Hellcatraz Theme - Audio and Design Features – block, retro visuals look superb

Hellcatraz has the feel of an old school video game. The pixelated imagery is excellent. With the Golden Gate bridge, the San Francisco skyline and the famous Alcatraz Island prison in the background, the front of the screen is guarded by a pair of police boats.

On the reel grid you’ll see lower value diamond, star, heart and clover symbols. More rewarding are the handcuffs, prison officer’s badge, shark, prisoner and officer. The visuals here are excellent and have a lovely retro feel. It works very nicely.

You can play Hellcatraz on desktop, mobile and tablet devices. Despite the 8-bit, 80s inspired graphics, it uses HTML5 technology so can be enjoyed on iOS, Windows and Android powered devices.

Hellcatraz Review Summary – unusual, volatile gameplay and original design combine to explosive effect

The Hellcatraz slot is an unusual game but it’s one that offers something original. That’s true of the game engine, the base game features, the bonus round and the design. The Super Free Spins feature has the potential to be a cracker, especially if you manage to add extra free spins to your original allocation.

A trip to Hellcatraz certainly isn’t one for the faint of heart. The action here is super volatile. It can be a risky proposition for your bankroll but it can deliver some massive rewards. The maximum win of 51,843.3 x stake per spin is worth risking being bad for.

It’s about as far away from a classic fruity as you can imagine but if you fancy trying something different, breaking into Hellcatraz could be the answer. Another slot with similar graphics is ELK Studios’ Flame Busters which offers plenty of bonus features and 5,280 x stake wins on every spin. A second option would be the Street Fighter II: The World Warrior slot by NetEnt which is based on the infamous video game.

If you want more prison drama, the San Quentin slot by Nolimit City takes things to a whole different level. Based on the infamous prison, this gritty title offers over 13 million ways to win, Jumping Wilds with multipliers up to 512x as well as 150,000 x stake wins on each spin.

Hellcatraz FAQs

❓ What is the Hellcatraz slot RTP?

This varies slightly depending on the round you’re playing. The Hellcatraz return to player rate in the standard game is a solid 96.46%. If you choose to pay to buy the Super Free Spins feature with the Buy feature, this increases to 96.83%.

🥇 What is the Hellcatraz maximum win?

In theory, the potential jackpots on offer from a trip to Hellcatraz prison are absolutely enormous. The maximum win stands at a massive 51,843.3 times your total stake. That sum sounds like it should get you into rather than out of Hellcatraz.

🎰 Does Hellcatraz come with free spins?

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Yes, this prison adventure does come with a Super Free Spins feature. It’s triggered in an unusual manner by collecting overlay key symbols. If you don’t want to wait, you can buy the bonus. Either pay 200 x your stake directly or use your collected keys and use cash to top up the rest.

⚡ What is the Hellcatraz volatility?

The virtual prison walls are highly volatile ones. This is a high-risk slot but the upside is the potential it offers to deliver some grandstand rewards. On a scale of 1 of 10, the Hellcatraz variance is a fiery 10.

Min bet size

0.10

Variance

High

Progressive Jackpot

No

Popularity

Max bet size

25

Bonus Features

Yes

Theme

Alcatraz

Hellcatraz video slot is an awesome eighties-style slot game with cheesy graphics and tons of features. Choose between 2 game modes, reveal mystery symbols, reap the rewards of cascading reels, trigger free spins by collecting keys, or simply buy the bonus using a ‘buy feature’!

Theme and Story Line

Hellcratraz is an 80s style slot game taken from the famous Alcatraz prison. There cops, inmates, and prison guards spinning on the reels set on a prison island in the USA!

Graphics, Sounds, and Animations

As Relax Gaming is going for the eighties look and feel, the reels are fuzzy-looking giving you eighties-style gaming graphics similar to an old Spectrum computer used back in this era. The slot’s background is set during sunset overlooking San Franciso’s city skyline and Golden Gate Bridge. Police sirens blare out from US police squad cars and Hellcatraz prison ships bobble on the city’s waters. You will also be treated to eighties-style animated effects as well as a bubbly theme tune.

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Gameplay

There are 2 modes to choose from which are ‘Mixed Mystery Symbols’ and ‘Lockdown Mystery Symbols’. When the reels open up you will be introduced to a 6x6 grid system with cascading symbol wins. Behind the reels, there are 46,656 way- to-win!

Your job is to line up any of the 9 regular symbols into combinations of 3, 4, 5, or 6. The total spin bet payouts for lining up 6 symbols on a pay line are as follows:

• Prison Guard - 2x
• Inmate - 1.2x
• Shark - 1x
• Guard Badge - 0.8x
• Handcuffs - 0.6x
• Playing Card Suits - 0.4x

There is a 10th symbol on reels 2-6. This is the Hellcatraz slot’s wild which is the ‘W’. It will substitute for any of the above regular symbols as a wildcard.

Bonuses and Free Spins

Cascading Reels: All winning symbols explode off the reels and are replaced by new ones in an attempt to give you more winning combinations for the price of a single spin.

Mystery Symbols: Mystery symbols are available in all game modes and free spins. They are numbers and will reveal their prize after a certain number of cascades. The number is a counter on, and once it reaches 0, it will give you a mystery win.

Super Free Spins: 5 spins are awarded when you collect 2,000 keys. The Mystery symbols in free spins do not have a counter, so they will reveal your prize as soon they hit the reels.

Collecting Keys: Keys are laid on top of regular symbols and award 1-10 when they land In view. Quite often multiple keys will land on the reels giving you 50 to 100 keys.

Feature Buy: Choose to buy either ‘full feature free spins’ or ‘top-up’. The ‘full feature’ purchase awards 2,000 keys instantly while ‘top-up’ will fill up your current key count to 2,000.

Mixed-mode Vs Lockdown Mystery Symbols: In mixed mode, the mystery symbol counters start at are mixed from 1 to 5 while in lockdown mode they all start at 5 but reveal bigger prizes.

Bet sizes, RTP and Variance

Hellcatraz Slot Poker

Min-Max bets of 0.10-25.00 are set under the ‘$’ sign option. Then, you can find the slot’s RTP under the ‘?’ menu which is 96.46% for lockdown mode and 96.30% for mixed-mode. If you use the ‘Feature Buy’, the RTP is 96.83%. As for the variance, this depends on the game mode:

• Mixed Mystery Symbols – High Variance
• Lockdown Mystery Symbols – Super High Volatile

Conclusion

Hellcatraz Slot Wins

The 2 game modes, a buy feature, mystery symbols, the free spins bonus trigger along with cascading reels may not be features that are new to the virtual world of video slots, but there are very few slots that have integrated all of these features into one. With that in mind, Hellcatraz and its retro eighties design make this a unique slot game worth trying out!