Editor's rating:
Published: May 11, 2020|Updated: May 12, 2020

Hellcatraz Slot Review (Relax Gaming)

From developers at Relax Gaming comes their highest-volatility slot with the biggest win potential – Hellcatraz!

This 6×6 grid slot plays with 46,656 ways to win, cascades and Mystery Symbols. It also has two game modes that you can choose for a high or super high volatile gaming experience. Trigger the Free Spins bonus to maximise your chances to with up to 51,840x bet. The only problem is that the bonus is tied to a long-term mission – collecting 2,000 Keys – which takes several hours to get through. Players who don’t have that much time but have enough balance can get the bonus spins rolling instantly by paying a “bribe” that is 200x bet using Feature Buy.

Relax Gaming’s fifth slot of 2020 is available for play at licensed and recommended slot sites like Wildz from May 5. Give it a shot if you have the guts or see my full review below to see what you’re getting into.

Play Hellcatraz at Licensed Slot Site
Recommended Relax Gaming casino

Non-sticky bonus
Get 100% Match to €/$500 + 200 Free Spins
Play here

Deposit €/$10 or more and get a 100% match bonus up to €/$500, plus 25 Free Spins per day, every day on a different game. Wagering requirement: 35x bonus. Free Spins wagering: 35x. Real money played first. Game weighting restrictions apply. New 18+ customers only. Play responsibly. Full T&C apply.

Lockdown Mode or Mixed Mode

Hellcatraz has two game modes, which you must choose before you can play.

Both are highly volatile and have just one difference: Mystery Symbols.

  • Lockdown Mode: Mystery symbols have the same counter (super high volatility)
  • Mixed Mode: Mystery symbols have mixed counter values (high volatility).

Mystery Symbols have a number on them, which indicates how many cascades there are left until they will reveal the randomly chosen symbol. In the mixed mode they will simply have different values, so that some of them activate sooner.

Since this is a slot with cascading symbols, any winning combo will explode resulting in semi re-spins. Such re-spins don’t cost extra and can result in more winning opportunities.

Mystery symbols can appear stacked. The same is true for 9 regular symbols which pay up to 2x per line, starting with 3-of-a-kind or more. Wilds on reels 2-6 usually don’t appear stacked and are not revealed by mystery symbols.

There’s one more symbol that’s key to the bonus…

Key Collection

Key symbols are overlay symbols which appear randomly on other icons. Every key symbol awards 1-10 keys into the Key Collector meter.

You need 2,000 Keys to unlock the Super Free Spins bonus. Note that the feature won’t reset even if you change your bet. Instead, the game calculates the average bet which it took to collect all Keys, and plays the bonus with that weighted average.

Because the keys appear infrequently, it can take thousands of spins until you collect enough of them. Players who are familiar with Big Time Gaming slots like Royal Mint MegaWays will find quite a few similarities there.

I don’t believe many players will have patience for that but those who do are in for a nice treat.

Super Free Spins Bonus

The Free Spins feature always starts with just 5 spins. This shows how ludicrously volatile this game can be, but don’t worry, there’s a way to win more freespins. For that you’ll need to unlock a Golden Mystery Symbol with 2 cascades. That will add +1 spin.

What’s special about the bonus itself is that the regular Mystery Symbols don’t count down. Instead, they will reveal a symbol right away, which often results in massive clusters. Even with low-paying suites this can result in some very impressive wins.

There’s a faster way to the bonus too.

Buy Feature Option

To shave off a good couple of hours of symbol collection, you can buy the Free Spins for 200x bet. That would be 20 credits if you play with 0.10 credits per spin, or a mind-boggling 5,000 credits if you play with 25 credits per spin.

Fortunately, if you have some keys in the Key Collector, each one will save you some money proportionally when you top-up for the missing keys.

👍 Tip: The RTP is 96.46% in the Lockdown mode, 96.30% in the Mixed mode, 96.83% in the Feature buy.

If you think you’ll fare better when you collect all 2,000 keys then you can learn from my experience. The win that I got from the Free Spins bonus after hours of key collection was no more or less than 38.5x. In the base game, however, I had some lucky moments resulting in some epic 384x wins.



Editor's rating:

Final Verdict

With low polygon visuals inspired by the pixelated games of the 80s, a stunning soundscape and immersive gameplay, this rollercoaster of a game will make an exciting addition to any operator’s slots portfolio.

Gavin Hamilton, Simon Hammon, Relax Gaming CPO

The resemblance of Hellcatraz with Flame Busters (Thunderkick) is uncanny. Nevertheless, Relax Gaming has created a monster of a slot that players with nerves of steel will enjoy.

Having triggered 1,000x in the bonus myself is a good evidence that there are some colossal wins to be had. Given its very volatile gameplay, however, I remain sceptical about Hellcatraz’ value for money for the more casual players. On the other hand, the phenomenal 50k win potential is there when you want to take the risk. After all, even one seemingly trivial combo in this 16-big game can compound your bets very quickly compared to most online slots. A well-executed theme and a nice flow of the game on top of that make it super easy to follow and play at your own pace, which adds extra points to the positive experience.

Good luck!

Non-sticky bonus
Get 100% Match to €/$500 + 200 Free Spins
Play here

Deposit €/$10 or more and get a 100% match bonus up to €/$500, plus 25 Free Spins per day, every day on a different game. Wagering requirement: 35x bonus. Free Spins wagering: 35x. Real money played first. Game weighting restrictions apply. New 18+ customers only. Play responsibly. Full T&C apply.

About Our Reviews

Full disclosure: Mvideoslots.com is an affiliate site which provides free information about online slots, slot sites and everything related. Some of the links on this site are affiliate links, so we may earn affiliate commission from casinos when someone makes a deposit through our site.

Note: We have never and will never do paid reviews. This means that both the casinos and game developers are seeing the reviews when they are published for the first time, right alongside you. We do not send them the reviews for an early look, so everything we say is our honest opinion. Should we ever do a paid article, it will not be a “review” and we will make sure to mark it as a sponsored article or an “ad”.

Can you trust Mvideoslots.com reviews? I hope so, because at the end of the day I want you to be happy with the casino or slot that you choose. But I also encourage you to look at other trusted sites which may have different opinions. If you decide to look around then make sure that it is a trusted source because it is common practice for casino operators to have their own “review sites” which are biased, not to mention the sites which have reviews written by people who are not following the industry.

Now that you know how we run things here, thank you for your supporting independent sites like us. If you have any questions, just send me an email.

Nikita, Founder and reviewer at Mvideoslots.com.

Relax Gaming slot reviewsSee all

See more Relax Gaming slot reviews

Very high
See all
Recommended Relax Gaming casino