Post Published: October 30, 2021
Author: Chlo


Scored by our Casino Expert Chloe

Hellcatraz Slot Review – Relax Gaming

Relax Gaming is one studio in the casino industry that are on the rise, thanks to their innovative ideas and creations. The studio has had big success so far in 2020, thanks to their list of slot releases. Some stand out more than others, such as ‘Snake Arena‘ and ‘TNT Tumble‘. Both games show us new innovative ideas, paired with fun gameplay. I always get excited when the studio announces a new game and hope for the consistent unique ideas. Today we are looking back to the year 2020 to learn all about an older forgotten release. This game is titled ‘Hellcatraz’, originally released 5th May 2020.

Hellcatraz is actually based on the Alcatraz prison which is located in the middle of San Francisco Bay. This prison is well known and an interesting choice for a slot theme. Even with the slot theme based around a prison full of criminals, the visuals have a retro design. The retro design does remind me of ‘Flame Busters’ by Thunderkick, just based on the visual aspect. The reel set is set where the prison is based, with police boats on either side and a bridge behind the prison in the night sky.

This game has a setup of 6 reels by 6 rows, this includes 46,656 pay lines. Hellcatraz is a high variance game due to the set RTP of 96.46% and max win capped at 51,840x. You can bet from £0.20 – £25.

Hellcatraz Symbols & Paytable

There are 11 symbols in total, this includes 4 low paying symbols. These are represented by diamonds, four-leafed clovers, hearts and stars. There are also 5 premium symbols, these are represented by handcuffs, police badges, sharks, prisoners and officers. In addition to these regular symbols is a wild and mystery reveal symbols. Wild symbols substitute for all symbols. The highest paying symbol is the officer premium, which pays 2x for a line up of 6.

Hellcatraz Features

There are 3 main features within this game, the first is ‘Mystery Reveal Feature‘. During every spin, there are mystery symbols present. Each symbol has a counter which is reduced by one each cascade. When the counter reaches 0, the reveal is activated and all affected mystery reveal symbols turn into the same symbol. However, there are two modes to choose from when you first load the game. Lockdown Mode and Mixed Mode, all mystery reveal symbols will have the same values. But in Mixed mode, there will be two independent counter values.

The second main feature is the ‘Super Free Spins‘ feature. This feature is triggered once you have collected 2000 keys. Key symbols appear randomly on top of normal symbols and each key awards 1-10 keys towards the count. During each spin, mystery symbols are present and always reveal without any cascades. You can trigger an additional spin when revealing a golden mystery symbol. When the symbol is present two cascades are required to reveal additional spins. The super free spins are played at an average bet from when the keys were collected.


Overall, I think Relax Gaming has done a fantastic job creating this new game. The gameplay is unique but still so fun thanks to the mystery reveal and key collecting. All of this paired with a high variance and max win of over 50,000x. Be sure to try the game for yourself and check out our exclusive casino offers.