Hellcatraz Slot by Relax Gaming
Hellcatraz is a 6x6 ways slot with cascading wins and a Key Collector meter by Relax Gaming, released in 2020.
Game facts
| Provider | Relax Gaming |
|---|---|
| Game type | Slots |
| Release date | 2020 |
| RTP | 96.46% |
| Volatility | High volatility |
| Max win | 51,840x the bet |
| Reels × rows | 6 × 6 |
| Pays | 46,656 ways to win |
| Bet range | 0.20–20 |
| Bonus buy | Yes · 200x |
| Wild symbol | Yes |
| Jackpot | No |
| Features | Cascading winsMystery symbolsWays to win |
| Themes | HalloweenHorror |
| Devices | Desktop and mobile browsers (HTML5) |
| Restrictions | Bonus buy only where available by jurisdiction |
| App | Yes — how to install |
Free demo of Hellcatraz
The free demo of Hellcatraz is on this page: no deposit and no real-money wins.
The demo uses virtual credits: no deposit, no real-money wins.
Where to play for real money
18+ · T&Cs apply · Gamble responsibly · Offers for your country
Real-money play is only for adults and only at licensed online casinos where online gambling is legal for you.
How to play Hellcatraz
Bet range: 0.20–20
- Winning combinations form on adjacent reels, and winning symbols are removed.
- New symbols cascade down to fill the gaps, creating more wins.
- Mystery symbols with countdown numbers drop by one with each cascade, turning into matching symbols at zero.
- Golden keys collect on a meter; reaching 2,000 keys triggers Super Free Spins.
Bonus features
Free spins
Super Free Spins trigger when the Key Collector meter reaches 2,000 keys. The round starts with 5 spins, and golden mystery symbols can add extra spins.
Bonus buy
200x the bet
Game Modes
the player chooses Mixed Mode (high volatility, mystery symbols can carry different countdown numbers) or Lockdown Mode (described as super high volatility, all mystery numbers start the same).
Mystery Symbols
countdown symbols show 1 to 5, drop by 1 with each cascading win and turn into a matching regular symbol at zero.
Cascades
winning symbols are removed and replaced, so one spin can produce several wins.
Wild
an orange W symbol substitutes for all regular pay symbols.
Key Collector
golden keys land randomly on top of symbols and award 1 to 10 keys each; 2,000 keys trigger Super Free Spins.
Super Free Spins
start with 5 spins, and mystery symbols reveal with fewer or no cascades.
In Super Free Spins, mystery symbols reveal with fewer or no cascades, and golden mystery symbols can add extra spins. The Key Collector meter fills with random keys, and the bonus buy price decreases as keys are collected.
RTP and volatility
| RTP version | Return per 100 staked |
|---|---|
| 96.46% | 96.46 |
| 96.3% | 96.30 |
The gap between versions is 0.16 per 100 staked.
The RTP of the version you play is shown in the game's information screen.
High volatility — With a hit frequency of 23.22% in Mixed Mode and 19.92% in Lockdown Mode, wins occur on average every 4.3 spins.
Hellcatraz app: download and install
The Hellcatraz app for Android downloads with the button on this page.
- Tap the download button on this page to get the installation file.
- When Android asks, allow your browser to install apps from this source.
- Open the downloaded file from your notifications or downloads folder.
- Confirm the installation when prompted.
Common questions
What is the RTP of Hellcatraz?
The default RTP of Hellcatraz is 96.46%. Casinos can also run versions at 96.3%; the gap is 0.16 per 100 staked. The RTP of the version you play is shown in the game's information screen.
What is the max win in Hellcatraz?
The max win in Hellcatraz is 51,840x the bet. At the maximum bet that is 1,036,800.
How volatile is Hellcatraz?
Hellcatraz has high volatility. A win lands every 4.3 spins on average.
How do free spins work in Hellcatraz?
Super Free Spins trigger when the Key Collector meter reaches 2,000 keys. The round starts with 5 spins, and golden mystery symbols can add extra spins.
Can you buy the bonus in Hellcatraz?
Yes, the bonus buy costs 200x the bet.
Similar slots
18+. Gambling involves risk; play only where online casinos are legal for you.
Updated: Oct 26, 2026