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Looking to play Hellcatraz by Relax Gaming? ➤ We list casinos and their bonuses for July 2020 ✅ Try the Hellcatraz demo game or read the review before you play for real ✅

Release: 05.05.2020
RTP 🔗: 96.46% [ i ]
Variance: HIGH
Betways: 46656
Max Win: x51840
Mr.Green: Welcome Bonus (UK)GB
100% up to £50 + 50BSClaim bonus

18+. Opt in required. New customers only. 1x per customer. Min. £20 deposit. 1st deposit only. Selected games only. Max. Bonus £50 35x wagering and 50 Free Spins at £0.10/spin on Lucky Mr Green 35x Wagering. Free Spins credited once deposit amount has been wagered. Bonus and Free Spins expire 7 days after issue. Full T&C Apply. www.gambleaware.co.uk. Please play responsibly


Online Casinos in United Kingdom where you can play Hellcatraz

We scanned 827 United Kingdom online casinos and found Hellcatraz in 51 of them. 1 casinos put Hellcatraz in their lobby. Average position in the casino lobbies is 150.53 (Calculated for all 827 casinos). SlotRank for Hellcatraz for United Kingdom is 933.

18+ | New Players Only. Min Deposit €/$/£10, Wagering Requirements: 20x. Account balance is withdrawable at any time. Upon withdrawal, any remaining bonus balance is forfeited. 7 days to activate the spins. Bonus spins expire after 4 hours. T&C Apply. BeGambleAware.org

18+ | T&C Apply | Be Gamble Aware

18+. New players only. Valid for 15 days after 1st deposit. Min Deposit £20 Max Bonus Bet £5 Winnings from spins capped at £50 First 100 Zee spins 10/day. Spins must be used within 24 hours, Funds within 30 days. Bonus funds are separate to Cash funds, and are subject to 35 wagering (bonus + cash). Full terms apply. BeGambleAware.org

18+ | T&C Apply | Be Gamble Aware

18+. New players Only. £10 min deposit. £5 max bet using bonus. 40 x wagering applies. Bonus valid for 14 days. 30 Spins on preselected games will be credited instantly + then 30 per day for 9 days. Free Spins valid for 72 hours from credit. Max Free Spins winnings £100. Skrill + Neteller excluded. Always refer to Bonus Terms - www.begambleaware.org. Full T&C's Apply.

18+ | T&C Apply | Be Gamble Aware

18+ Full T&C's Apply. New players Only. £10 min deposit. £5 max bet using bonus. 40 x wagering applies. Bonus valid for 14 days. 30 Spins on Starburst games will be credited instantly + then 30 per day for 9 days. Spins valid for 72 hours from credit. Max Spins winnings £100. Skrill + Neteller excluded. Always refer to Bonus Terms - www.begambleaware.org

18+ | T&C Apply | Be Gamble Aware

18+. New players only. One bonus offer per player. Minimum deposit of £10, Max bonus bet £5 Bonus offer must be used within 30 days and bonus spins within 10 days, otherwise any unused shall be removed. Bonus spins are valid on the following games only: Gonzo’s Quest, Twin Spin Delux, Asgardians Stone and Bloodsuckers 2 and winnings capped at £50 Bonus funds are 100% of your first deposit up to £100, 50% of your second deposit up to £250, 50% of your third deposit up to £150 Bonus funds are separate to Cash funds, and are subject to 35 x wagering the total of bonus, cash & bonus spins. Terms Apply. BeGambleAware.org.

18+ | T&C Apply | Be Gamble Aware

18+. New Players only. Min deposit of £20 Max bonus bet £5 Bonus funds must be used within 30 days and bonus spins within 10 days, otherwise any unused shall be removed. 200 Bonus spins are valid on the following games only: Gonzo’s Quest and Starburst. Bonus spins to be credited at a rate of 40 bonus spins per day over five days, triggered on your first deposit. Bonus spins winnings credited in the form of bonus funds and capped at £100 Bonus match offers are 125% of your first deposit up to £300, 75% of your second deposit up to £300, 50% of your third deposit up to £300, 25% of your fourth deposit up to £300, 100% of your fifth deposit up to £100 Bonus funds are separate to Cash funds and are subject to 35x wagering on your bonus funds only. Full promotional terms below apply. BeGambleAware.org

18+ | T&C Apply | Be Gamble Aware

First deposit only. 50 Free Spins on the Book of Dead slot. Min deposit £10. Excl. new players in N.I. Each Free Spin valued at 10p. OJO’s Rewards and Game Play policy applies.

18+ | T&C Apply | Be Gamble Aware

18+. 1st deposit only. Only 1 of 3 offers can be claimed. Available 14 days from registration. 3 day spins expiry applies. Any winnings credited as cash. Further eligibility and terms apply.

18+ | T&C Apply | Be Gamble Aware

Lobby: position of Hellcatraz in the casino lobby. (Position in the lobby | Overall games in the lobby).

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Hellcatraz slot game review

Anyone who’s ever owned an Atari or Amiga (or even a Commodore 64) is in for a real nostalgic treat here. Relax Gaming has clearly been inspired by Thunderkick’s legendary Flame Busters when they made Hellcatraz slot, but the two games have only the charming 8-bit audiovisuals in common. This is not in any way a copycat game, and as a proud ex-owner of an Amiga myself, this reviewer hopes more developers will get into the business of creating video slots inspired by retro video games style.

The reels are set inside a prison building on a small coastal island, undoubtedly inspired by the infamous and “inescapable” Alcatraz prison, located in the San Francisco Bay. Many a good escape movie has been made about that prison, and we welcome the 8-bit video slot version with open arms. The math model is about as brutal here as we imagine life in the real penitentiary must have been, but the massive 51,840x potential makes it worthwhile to attempt a prison bust.

The base game is riddled with innovative countdown mystery symbols, and these can help you land bigger wins when they get activated once in a while. The main attraction by far is the bonus round, where you will benefit from the mystery symbols on each spin. Choose between 2 different game modes, one more volatile than the other, and watch the backdrop switch from day to night. Any fan of high risk/reward games will have a field day here, and even if you’re a millennial, you should still be able to appreciate the beauty of the origins of modern day video games.

Hellcatraz Epic Win

What symbols are there?

There are 9 regular symbols in play here, and the highest value symbol is the stern looking correction officer guarding the 8-bit Hellcatraz prison. Right next to him you’ll find the smug mugshot of a smiling Al Capone lookalike with a cigar hanging from the corner of his mouth. Also the sharks circling the prison island is represented on the reels, and you need between 3 and 6 matching symbols to win. Here is the paytable for Hellcatraz slot:

  • Correction officer - Pays 2x for 6 on a payline
  • Prisoner - Pays 1.2x for 6 on a payline
  • Shark - Pays 1x for 6 on a payline
  • Guard’s badge - Pays 0.8x for 6 on a payline
  • Handcuffs - Pays 0.6x for 6 on a payline
  • Card suit symbols - All pay 0.4x for 6 on a payline

What are the bonus features?

The wild symbol in this game is a simple orange W, and it will step in for all regular symbols to help you form winning combos. There is also a cascading wins feature in play here, which means that winning symbols are removed from the reels to be replaced by new ones falling from above. This allows for more than one win per spin, and the cascading goes on as long as you keep landing new winning combinations.

The main base game feature is the Mystery Reveal feature. You will always land symbols displaying a different set of numbers between 1 and 5. The set of numbers can be either identical on all the symbols, or it can be mixed. This depends on which mode you play in, the lockdown mode or the mixed mode.

These number symbols serve as mystery symbols that you can unlock. You do this by getting the same number of cascading wins as the number displayed on the mystery symbols. In other words, the mystery number counts down 1 digit per cascading win, and when it reaches zero all the number symbols turn into an identical regular symbol to help you form winning combos.

Free spins in Hellcatraz

Sometimes you will land small golden keys on top of regular symbols, and these are collected in a meter on the left-hand side of the reels. Each key can give you between 1 and 10 keys added to the meter, and you need to fill the meter with 2,000 keys to trigger the Super Free Spins bonus round. You will land keys quite often, but it will still take a while to trigger the feature.

You always start out with 5 free spins, and the good news is that all the mystery symbols you land during the bonus round do not require any cascading wins to reveal themselves (at least not in Lockdown Mode). If you play in the Mixed Mode, you will get a bunch of mystery symbols unlocked on each spin too, but you will also get some requiring 2 cascading wins to be revealed.

What’s more, you will also benefit from special Golden Mystery Symbols during the free spins feature. These are your key to getting more spins, as 2 of them on the reels combined with 2 cascading wins will give you 2 extra free spins added to your tally.

The bonus round can also be bought (depending on your jurisdiction), and this will cost you 200x your stake if you have collected zero keys. You can also use whatever keys you have gathered, which gives you a nice discount when you buy the feature.

How to play

The first thing you need to consider when you start playing Hellcatraz slot is which mode you want to play in. This is pretty important, as it impacts both the gameplay and the volatility significantly. If you go with the Mixed Mode, the game is still considered highly volatile, but now the mystery number symbols that land on each spin will be mixed.

This means that you can land a batch of countdown symbols with the number 5, and these can go together with a batch where 3 is the countdown number, as an example. The benefit of this, is that you have a bigger chance of getting to zero on at least one of the batches, although all mystery symbols can sometimes show the same number in this mode too.

The lockdown mode is about as hardcore as it sounds, and now the game has what’s described as super high volatility. All the mystery number symbols will land with identical numbers here, which means that you can expect bigger wins if you manage to unlock them.

Hellcatraz Epic Win

When you have picked the mode you feel is right for you, it’s time to choose the bet level between 10p and £25 per spin. There is an autoplay feature where you can autospin between 10 and 1,000 spins, and even infinite autospins are possible here. You can also set a win or loss limit, both for single wins and combined wins. Of course, manually spinning the reels is also possible, and quickspin mode makes for very rapid gameplay here.

Where to play Hellcatraz?

Perhaps you’re eager to get going with this game already, and we don’t blame you the slightest bit for that. This is a very exciting slot for sure, but it can be a good idea to test it out in demo mode before you actually play for real. Don’t worry, however, cause we have the perfect solution for you no matter what you prefer.

Play for real money

If you feel ready to go for the big wins with real money, we have an algorithm in place that ranks all the casinos that carry Hellcatraz slot. All you have to do is click the link below, and you will be taken to the top of this page. Here our selection of licensed and safe casinos are listed with their respective welcome bonuses. Pick and choose as you wish, and play Hellcatraz for real money now.

Play free demo version

Being a very volatile game, it can be a good idea to give it a testrun in demo mode before you start to wager your own money. This way you will get a feel for the gameplay, and you can decide on a bet level that will suit your bankroll with peace of mind. Don’t worry, you don’t even have to leave this page to play Hellcatraz slot for free. Follow the link to the top of this page and play Hellcatraz in demo mode now.

The 200 Spins Hellcatraz Trial

Nothing beats that new slot feeling, and the first 200 spins is always a good test of how much beginner's luck we have managed to muster this time. Please keep in mind that this is a very subjective trial run, and that your first 200 spins might play out completely differently than ours did. Still, allow us to present you with our initial experience with Hellcatraz slot.

As always, we set the bet level to £1 per spin, and immediately checked out the paytable. This gives us a good overview of how much each symbol pays out per total stake, and in this case all the symbols pay between 0.4x and 2x, which is unusually low to say the least. Still, we knew that insane wins are possible here, so it was with eager anticipation we set the mode to mixed and auto-played the first 100 spins.

It became immediately apparent that you will get a lot of dead base game spins here. This is due not only to the high volatility, but also to the fact that the numerous mystery symbols that land on each spin very often will not be unlocked. This takes up a lot of prime real estate on the reels, but when we finally managed to unlock them, we landed a decent “big win” of 49x our stake.

Hellcatraz win

That was hardly enough to keep us afloat, so we decided to switch to Lockdown Mode. It did not feel all that different at first, but when a massive bulk of mystery symbols unlocked, we won a decent “epin win” of 89x our stake. We also bought the bonus round one time for each of the 2 modes. This landed us a solid 428.5x our stake in Lockdown mode, and an okay 116x our stake in the Mixed mode.

Review Summary

Growing up in the 80’s makes this reviewer a sucker for anything 8-bit, but it’s still our more or less unbiased view that Relax Gaming has created a highly volatile little masterpiece with Hellcatraz slot. Our best advice is to play in Lockdown mode, cause you really need those big mystery symbol wins once in a while to keep you afloat, and the volatility is not really that different either way.

The mystery symbol countdown is innovative for sure, but it can also be a bit frustrating since “dead symbols” take up so much space on each spin. If you have the chance, it’s probably a good idea to purchase the bonus round after you’ve collected a decent amount of keys, as this is where you can expect the big wins to come. The max win potential of 51,840x is impressive, but this is not a game for casual low-risk players.


  • 2 different gameplay modes
  • Innovative mystery countdown symbols
  • Free spins with mystery symbols
  • High volatility and 51,840x max win potential


  • Not for low-risk players
  • Max bet is “only” £25

If you appreciate Hellcatraz you should also try:

There are not that many games out there that look like an old-school 8-bit video game, but there is at least one that closely resembles Hellcatraz. Here we shall present you with this “competitor” game, as well as a few others that you might also like.

Flame Busters - clearly Thunderkick’s 8-bit masterpeice has been a source of inspiration for Hellcatraz, but it’s in no way a copycat slot. Flame Busters is also a highly volatile game, but the max win potential is around 10 times lower here. Still, this is a charming and highly entertaining game, which comes with random fire drills and an elaborate bonus round.

An Escape from Alcatraz - is modelled after a physical slot machine, which is another way of dipping into that sweet nostalgic feeling of a simpler time. The main attraction is the bonus game, where you will help a convict escape the legendary prison island. There are 3 levels to this prison break bonus game, and if you make it all the way to the mainland, you will not walk ashore empty handed.

Prison Escape - is another intriguing prison break slot with a very elaborate bonus game. You will guide the escapee through a massive bonus trail, with the angry guards spread out across the board. There are plenty of bonuses to pick up along the way, which means you will escape the prison a rich man if you succeed.

Street Fighter 2: The World Warrior - is our last (but not least) recommendation. The binary digits might have been upgraded to 16-bit here, but it’s still a nostalgic trip down memory lane for most players of a certain age. This game is as close to a real video game that a slot can come, and it’s simply a must try for all slot playing video game fans out there.

TOP250 Silver badge for Hellcatraz

In May 2020 Hellcatraz (Video Slots from Relax Gaming) reached TOP128 position in the SlotRank for UK market.

Proof of achievement you can see on the SlotRank page.

Provider Relax Gaming
Release 05.05.2020
RTP 96.46% [ i ]
Variance HIGH
Hit Frequency 19.92[ i ]
Max Win 51840
Min bet (Max bet)
$, €, £
0.2 (20)
Layout 6-6 icon
Game type Video Slots
Betways 46656
Features Buy Feature, FreeSpins, Mystery symbol, Symbols collection (Energy), Wild
Theme Pixel art
Devices icon Desktop, Tablet, Mobile
Technology JS, HTML5
Last Update 29.05.2020

Hellcatraz Slot FAQs

❔ What is the Return to Player percentage of Hellcatraz?

The RTP of this game depends on which of the 2 modes you choose. The Mixed Mode comes with an RTP of 96.46 %, while the Lockdown Mode comes with an RTP of 96.30 %. If you buy the bonus round, however, the RTP increases to 96.88 %. Read more about RTP here.

❔ What is the volatility and hit frequency of this game?

The volatility is high even if you choose the less hardcore Mixed Mode, and it becomes even higher if you go for the Lockdown Mode. Also the hit frequency varies with the two modes, and you can expect to hit something on 19.92 % of your spins in the Lockdown Mode, while the hit frequency increases to 23.22 % in the Mixed Mode.

❔ How does the innovative Countdown Mystery Symbols work?

You will land many symbols with numbers between 1 and 5 on each spin, and these numbers will decrease by 1 for each cascading win. When the counter hits zero, all the previous “dead” mystery symbols will reveal a random matching regular symbol. If you play in Mixed Mode, you can get symbols that start at different countdown numbers, while they all start at the same number in the Lockdown Mode.

❔ Does Hellcatraz come with a free spins bonus round?

Yes, the free spins feature is the main feature where you can expect most action and the biggest wins. You trigger the feature by collecting 2,000 keys, or you can opt to buy the feature (in some jurisdictions) for 200x your stake. You can also use collected keys to get a discount when you buy the bonus round.

❔ What is the biggest win possible in Hellcatraz slot?

The max win here is a staggering 51,840 times your stake, which is higher than most Megaways engine games. The payout is still limited by a somewhat low max bet of £25, but even so, massive wins up to £1,296,000 is possible here.

Video and Image gallery

18+. Opt in required. New customers only. 1x per customer. Min. £20 deposit. 1st deposit only. Selected games only. Max. Bonus £50 35x wagering and 50 Free Spins at £0.10/spin on Lucky Mr Green 35x Wagering. Free Spins credited once deposit amount has been wagered. Bonus and Free Spins expire 7 days after issue. Full T&C Apply. www.gambleaware.co.uk. Please play responsibly

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Hellcatraz statistics.See full SlotRank calculation

Quantity of casinos

Gray line shows quantity of casinos which have "Hellcatraz". Green line is the quantity of casinos placed the game on their lobby.


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928. (-97) The Finer Reels of Life 149.85

929. (+21) Fortune Charm 150.53

930. (+21) Treasure Raider 150.75

931. (+21) Fruit Fiesta 5 Reel 150.62

932. (+17) Respin Mania Mega Reels 149.86

933. (+21) Hellcatraz 150.53

934. (+21) Mega Ball First Person 149.86

935. (+18) Power of Gods: The Pantheon 149.86

936. (+21) Golden Leprechaun 150.53

937. (+30) Tunzamunni 150.63

938. (+10) Napoleon: Rise Of an Empire 149.87


Position in lobby

Average position in the casinos lobby. Position is calculated for all casinos. When casino does not have the game on the lobby position is taken as 151.

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