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A fun and unique slot featuring a novel Mystery Symbols feature and a free spins round that can be unlocked by collecting keys in the basic game. Awesome 8-bit arcade-style graphics with a San Francisco Bay-themed background. Excellent gameplay and a gigantic 51,840x payoff possibility.

Hellcatraz Slot Review

Where Can I Play Hellcatraz Slot?


Relax Gaming is a fascinating slot company right now; they’re putting out some very inventive and well-designed games. TNT Tumble, a high volatility grid game with ‘drilling wilds,’ multipliers, and free spins, is a great game to play. Meanwhile, they contributed to Fantasma Gaming’s Heroes Hunt, which was developed on their Silver Bullet platform and included innovative gamification to give the Megaways™ series a much-needed dose of fresh ideas. Hellcatraz is up next for them, a game with a distinct look that borrows a page from one of Thunderkick’s legendary high volatility games, Flame Busters, as those with a sharp eye will note. Relax’s slot features retro Atari graphics and is based on the famed jail block in San Francisco Bay, which housed some of the country’s most notorious criminals before it was converted into a tourist attraction. Hellcatraz, on the other hand, is renowned for its two variance settings and a massive top payoff of over 50,000x.


Anyone who grew up playing 8-bit Atari games in the 1980s, or who has subsequently played one of the online simulations, would recognize Hellcatraz’s aesthetic. The mock-San Francisco Golden Gate Bridge and metropolitan cityscape serve as the backdrop for the 6×6 reel grid. As the game progresses from the regular game to the bonus round, the scene changes from day to night, which is very awesome.

The card suit icons — spades, clubs, diamonds, and hearts – represent low value symbols on the reels. A shady-looking criminal leader, a jail officer, a prison guard, handcuffs, the guard’s badge, and a shark (what you’d get if you tried to swim for it!) are among the premium symbols. At 2x for six on a payline, the jail officer is the highest paying symbol of the bunch. A Wild (the letter W) can be substituted for any other symbol to form winning lines.


You may pick between two levels of volatility before spinning the reels in this game. Both Mixed Mode and Lockdown Mode have a high level of security. The latter has a larger variance than the former. Lockdown Mode has a variance of 96.3 percent, whereas Mixed Mode has an RTP of 96.46 percent. The game’s biggest promised payoff is a colossal 51,840x. In a nutshell, this is a slot for high-risk gamers only — it can offer some really unpleasant sessions, but as you will see, it may also deliver some bizarre rewards triggered by some spectacular event triggers.

When picking your stake, keep all of this in mind. If you have a little bankroll, the lowest bet of $0.20 each spin is a good place to start, however there are larger stakes available.

Cascading Wins


Hellcatraz follows the well-known Cascading Wins pattern, in which the symbols that make up the winning lines are removed from the reels and replaced with new ones after each victory. If this results in another win, the procedure is repeated. And so on, until there are no more wins.

Symbols of Mystery

Mystery Symbols are popular on slot machines, especially in MegawaysTM games. There is a small change in the format here. After each cascade, the counter on each one decreases by one. When the countdown hits zero, the symbols become visible and can help you win. When a cascade sequence is completed, the counts are reset.

There are differences between the two modes as well, with all Mystery symbols having the same value in Lockdown Mode. Their values in the Mixed Mode are independent of one another and may be different or the same.

Keys & Super Free Spins

Hellcatraz adds gamification to the slots experience in the same way as Fantasma’s Heroes Hunt did. It’s all about collecting Keys here. When they appear on top of ordinary symbols, the Key Meter to the left of the reels will rise by 1 to 10 keys at random. The Super Free Spins round is activated once 2,000 keys have been collected.

The Mystery Symbols are revealed on each spin in this round of 5 spins, with no countdown. There are also Golden Mystery Symbols, which contribute to your amount of free spins. Both of these upgrades improve your chances of obtaining a greater reward.


In an era of replicated games, Hellcatraz stands out as a unique, original, and interesting slot. While Mystery Symbol elements may be minor in some of the most popular Megaways games now available, they are crucial in this case. They’re weaved into the main game’s Cascading Wins and are crucial to unlocking the free spins round’s greater wins. So keep an eye out for them and learn how to use them when you first start. Then it’s all about the Key Feature and getting those free spins. If you enjoy gamification, you’ll enjoy this slot; it takes a while to accumulate 2,000 keys, but it’s well worth the wait. The only other item to mention is that you’ll be playing high volatility spins in any mode, so keep that in mind and bet sensibly.

Hellcatraz Profile

Slot Varience - High



Release Date: 1970
Studio: Relax Gaming
Game Type:
Reels: 6
Stake Range: Min 0.20

Jackpot - 51,840x


Mystery Symbols, Cascading Wins, Key Collection to Unlock Free Spins

4.5 Play now

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