Hellcatraz slot explained

What is the Hellcatraz slot?

Hellcatraz is a 2020 game from Relax Gaming, the studio behind the Money Train series. The name blends a notorious island prison with an underworld setting, and the game sits alongside other prison-themed titles that lean into dark, gritty art. What sets it apart mathematically is a large, fixed grid: six reels, each showing six symbols, for 36 positions and 46,656 ways to win.

Two other figures define it. The cap is 51,840 times the stake, among the higher ceilings in our facts. And the volatility is listed as high to very high, which means the route to that cap is extremely rare and most sessions look nothing like it.

46,656 ways: how the Hellcatraz slot machine counts wins

On a ways to win slot machine, there are no drawn paylines. A win needs the same symbol on adjacent reels from the leftmost reel, in any row. The number of ways on a fixed grid is the number of rows multiplied together across all reels: six rows on six reels gives 6⁶, which is 46,656.

When a win lands, the game counts how many ways it pays. It multiplies the number of copies of that symbol on each reel in the winning run. That is why one spin can pay the same symbol many times over.

If the paytable listed that symbol at 0.2x the stake for three of a kind, six ways would pay 1.2x, which is 24p at 20p a spin. The 0.2x figure is illustrative; read the real values in the game’s paytable. Our guide to 243 ways slots uses the same counting method on a smaller grid.

Hellcatraz features and bonus: what to check in the rules

Hellcatraz has special symbols and a bonus round that do most of the heavy lifting toward its high ceiling. We have not been able to verify the details from Relax Gaming’s own material, so rather than repeat second-hand descriptions, here is how to read the feature pages yourself. Every UK-licensed casino must show the game rules, and Relax’s help screens set out each feature with its trigger and effect.

1. Open the game and select the information or rules icon.
2. Read the wild symbol section: note what it substitutes for and whether it carries multipliers or stays in place.
3. Find the scatter or bonus symbol section: note how many are needed to start the bonus and how many spins it gives.
4. Look for any mention of modes, including what Mixed Mode means and whether you can choose between options.
5. Find the RTP and the maximum win statement near the end of the rules.

Hellcatraz includes features that only appear in its bonus. Whatever they are, they cannot change the odds on the next spin: every result is fixed by the random number generator the moment you press spin.

Hellcatraz RTP: what “96.46% Mixed Mode” means

Our facts give the Hellcatraz RTP as 96.46% with the label Mixed Mode. A mode label tells you the figure is quoted for a particular way the game is set up, rather than as a single unlabelled number. The rules screen at your casino will explain the modes and give the RTP for the one you are playing. If the figure there is different, trust the screen.

On a game this volatile, the average cost is a poor guide to a single session. A large share of the 96.46% is paid out through rare, very large results, which means the typical session loses more than the average figure suggests. Our explainer on standard deviation shows how spread is measured.

Budgeting for high to very high volatility

A sensible approach with a game like Hellcatraz is to decide how many spins you want to pay for, set a limit that matches, and treat any feature as a bonus to the session rather than its purpose. The table shows how far a £20 budget goes at different stakes if nothing comes back.

Most sessions will see some returns, so the budget lasts longer than this, but the table shows the downside clearly. Setting a deposit limit before you start keeps the plan in place.

Hellcatraz max win: 51,840x at UK stakes

The Hellcatraz max win is 51,840 times the stake. UK online slots are limited to £5 per spin for players aged 25 and over and £2 per spin for those aged 18 to 24, as set out in the Gambling Commission’s stake limit guidance (opens in a new tab).

A high cap does not mean a high chance. Most of the time, the cap figure matters only because it shows how much of the game’s return is reserved for extremely rare results. Read more on max win caps.

Hellcatraz and other prison-themed slots

Prison themes are popular with studios that build very volatile games. Using our verified facts:

Folsom Prison and San Quentin xWays push the ceiling further at the cost of even harsher swings. Money Train 2 is Relax’s own high-volatility benchmark with a similar cap.

Hellcatraz demo

A Hellcatraz demo lets you see the 6x6 grid and the feature screens without staking money. In Great Britain, free demo play is only available after age verification, a rule in force since May 2019. The demo uses the real game’s maths, but on a very high volatility game even hundreds of demo spins tell you little about what the next hundred will do.

UK rules that apply to Hellcatraz

Very volatile games are often sold with a bonus buy in other markets. Slots at UK-licensed casinos do not offer one, so the Hellcatraz bonus is reached only in normal play. The Gambling Commission’s online game design rules (opens in a new tab), in force since 31 October 2021, also ban autoplay, turbo and slam-stop, require at least 2.5 seconds per spin, and stop games from celebrating returns that are equal to or less than the stake. Your net position stays on screen, which helps on a game where small returns are common.

The autoplay ban matters more than it might seem here: on a game with long gaps between features, starting each spin by hand is a natural point to check the clock and the balance.

Hellcatraz myths and facts

• Myth: more ways means more wins. 46,656 ways describes how wins are counted, not how often they come. The symbol mix on the reels sets the hit rate.
• Myth: the big cap is ‘due’ to be hit somewhere. Each spin is independent, and no slot builds up toward its cap. See loose and tight slot machines.
• Fact: a fixed grid makes the ways constant. Unlike Megaways, which change the row count every spin, Hellcatraz always shows six rows on every reel.
• Fact: the RTP label matters. The Mixed Mode label tells you to check which version you are on before comparing it with other games.

Is the Hellcatraz slot worth playing?

It suits adults with a firm budget who accept that most sessions will lose. If that sounds uncomfortable, a medium volatility slot will give a steadier ride. GAMSTOP (opens in a new tab) lets you block all UK-licensed gambling sites for six months to five years if you need a break.

Where to play Hellcatraz in the UK

Relax Gaming games appear at many UK-licensed casinos, but we cannot confirm that any partner lists Hellcatraz at present; search the lobby, because game availability changes. Coral gives new players 100 free spins at 10p after a deposit and £10 or more of slot bets, on selected games, accepted within 48 hours and valid for 7 days. Ladbrokes gives 50 free spins a day at 10p for ten days (up to 500) after £10 of slot play. PlayOJO gives 80 free spins at 10p on Big Bass Bonanza with a first deposit of £10 or more. The spins are not for Hellcatraz, and winnings from all three come with no wagering.

All three offers are for new customers aged 18+, and full terms apply, including excluded payment methods. Coral and Ladbrokes are run by the same company, so check the terms before opening both. More detail is on our casinos page, and the slot machine guides index covers every game we explain.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: plan a slot budget. Free, confidential help: National Gambling Helpline 0808 8020 133.