Hellcatraz free spins means either casino promotional spins played on Relax Gaming's 46,656-ways prison slot or the free spins feature inside the game. A 10p spin is worth about 9.6p on average at the 96.46% RTP, but this is a high-to-very-high volatility game, so most short batches return far less while a rare one returns far more.
100 spins at 10p are £10 of play with an average return of about £9.65 at 96.46% RTP.
Volatility is high to very high: the 51,840x maximum (£5,184 on 10p) is rare by design.
Relax Gaming's launch notes describe Key symbols that build towards Super Free Spins; check the help screen for full rules.
No partner lists Hellcatraz for its welcome spins; check the selected games in each offer.
Developer
Relax Gaming
RTP
96.46% (Mixed Mode)
Volatility
High to very high
Layout
6 reels x 6 rows
Ways to win
46,656
Max win
51,840x stake
Released
2020
What Hellcatraz free spins really means
Search for Hellcatraz free spins and you will find two separate ideas. One is a casino offer: spins at a fixed stake that a casino lets you use on this slot, usually after a deposit or a bet. The other is the slot's own feature round, which you reach by landing the right symbols and which pays out under the game's rules. The casino can change the first; it has no say over the second.
Because Hellcatraz is one of the more volatile games a promotional spin might land on, the gap between what spins are worth on paper and what a typical batch returns is wider than usual. We set out both, along with the UK rules that apply. For spin offers on other games, see our free spins hub.
Hellcatraz RTP, ways and max win
Relax Gaming released Hellcatraz in 2020. Its grid is six reels by six rows, which gives 46,656 ways to win on every spin. The listed RTP is 96.46%, labelled as the Mixed Mode figure, so check the game's information screen for the version your casino runs. The published maximum win is 51,840 times the stake.
Hellcatraz maximum win by stake
Stake per spin
Max win at 51,840x
Who can stake this in the UK
10p
£5,184
All adults (common free spin stake)
20p
£10,368
All adults
£1
£51,840
All adults
£2
£103,680
Upper limit for players aged 18 to 24
£5
£259,200
Upper limit for players aged 25+
A maximum is a ceiling, not an expectation. On a game this volatile, almost all spins and most sessions end far below it. Our RTP glossary entry and volatility entry explain how the two numbers work together.
Hellcatraz free spins value per batch
The average value of promotional spins is spins × stake × RTP. With a 96.46% RTP, the house edge is 3.54%, one of the lower edges among the slots we cover.
Average return from 10p Hellcatraz spins
Spins
Face value
Average return
House edge cost
30
£3
£2.89
11p
50
£5
£4.82
18p
100
£10
£9.65
35p
150
£15
£14.47
53p
On paper, that's close to face value. In practice, very high volatility means a typical batch of 50 spins is likely to return less than £4.82, because a large share of the RTP comes from rare, large results. Our explainer on the average win from 100 free spins shows why the average and the typical result differ.
How to trigger free spins on Hellcatraz
We could not check Relax Gaming's full game rules, so we describe only what its 2020 launch announcement set out and leave the exact counts to the game's help screen. The announcement described a collection mechanic built around Key symbols and Mystery Symbols.
Watch for Key symbols: according to the launch notes, each awards up to 10 keys.
Keys build up towards Super Free Spins; the help screen shows how many are needed and whether progress is kept between sessions.
In Super Free Spins, Mystery Symbols reveal their symbol straight away.
Golden Mystery Symbols can add extra spins after cascades, as described in the launch notes.
Check the paytable for the standard free spins trigger and the number of spins awarded.
A promotional offer suits a slot best when you understand its risk profile. Hellcatraz sits at the high-to-very-high end, so short batches are dominated by small or empty results. That has three consequences for a bonus:
No-wagering spins: the average is still around 96p per £1, but expect most batches to return less, with the occasional large one balancing the figure out over many players.
Spins with wagering: a bonus balance can drop to zero long before wagering ends, so the average value overstates what most people keep.
Winnings caps: a cap such as £50 or £100 removes the rare large results that make up much of the RTP, so the capped value is well below the simple sum.
Hellcatraz free spins no wagering against wagering
Wagering means staking bonus winnings a set number of times before you can withdraw them. Since 19 January 2026, it can't exceed 10x the bonus in Great Britain. Here is the arithmetic on 100 spins at 10p with average winnings of £9.65.
None of our partners offers a no-deposit bonus, and no-deposit spins on a named slot are rare at UK-licensed casinos. Where they exist, expect a small number of spins, a modest cap on winnings and identity checks before a withdrawal. You must pass age verification before gambling at all, including demo play.
Since 31 October 2021, UK slots can't offer autoplay, turbo or slam-stop, must take at least 2.5 seconds a spin and can't celebrate a loss as a win; the Commission's summary of the slot design changes (opens in a new tab) sets out the exact wording. Stake limits of £5 (25+) and £2 (18 to 24) also apply. Feature buys aren't offered on slots at UK-licensed casinos.
Relax Gaming was founded in 2010, started in Tallinn and is now based in Malta. It has made its own slots since 2018, holds a Gambling Commission licence (account 37462) and runs the Dream Drop jackpot network launched in 2022. Its best-known series is Money Train. See Relax Gaming free spins for more of its games.
Where to use free spins if you like Hellcatraz
No partner of ours names Hellcatraz in its welcome offer. These are the spin offers we can point to. All need you to be 18+ and a new customer, and terms apply.
Partner free spin offers
Casino
Qualifying step
Value
Game choice
Time limits
PlayOJO
£10 minimum first deposit
80 × 10p = £8, cash winnings
Big Bass Bonanza only
See the offer terms
Coral
Deposit and bet £10 on slots
100 × 10p = £10, no wagering
Selected games in the offer
Accept in 48 hours; use in 7 days
Ladbrokes
Deposit and spend £10 on slots
50 × 10p daily for 10 days, up to £50, no wagering
Selected games in the offer
Claim by 23:59 daily; use in 7 days
None of these is on a slot as volatile as Hellcatraz, so the spread of results will be narrower. PlayOJO's offer excludes Northern Ireland. Coral and Ladbrokes exclude e-wallets such as PayPal, Skrill and Neteller, plus Paysafe and prepaid cards; Coral also excludes certain debit cards. Check each promotion's game list, and note that Coral and Ladbrokes share an operator.
Coral and Ladbrokes are both run by LC International Limited (Entain). If you already hold an account with one Entain brand, you may not be able to open a new account with another; check the terms before signing up.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read the PlayOJO reviewLicence: Skill On Net Limited, UKGC account 39326. Offer checked 5 October 2026.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Coral reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Ladbrokes reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: set a budget. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
How do you trigger free spins on Hellcatraz?
Check the paytable for the standard trigger and number of spins, because we haven't verified them from Relax Gaming's game rules. Relax Gaming's 2020 launch notes described Key symbols that each award up to 10 keys, building towards Super Free Spins in which Mystery Symbols reveal immediately. Promotional spins can start features just as paid spins can. Our free spins round entry explains the general terms used in help screens.
What is the Hellcatraz RTP?
The listed RTP is 96.46%, labelled as the Mixed Mode figure, giving a house edge of 3.54%. That is the long-run average across a huge number of spins, not a guide to any session. Casinos may run a different version, so check the information screen in the game. On a slot with high to very high volatility, short-term results vary enormously. Our page on high RTP slots for bonuses puts the figure in context.
What is the Hellcatraz max win?
The published maximum is 51,840 times the stake. That is £5,184 on a 10p promotional spin, or £259,200 at the UK's £5 stake limit for players aged 25 and over. It is a ceiling that very few spins approach. If you are using spins from an offer with a winnings cap, the cap is applied first. Our casino bonus max win page explains how caps work in UK terms.
What are 100 Hellcatraz free spins worth?
At 10p each, 100 spins are £10 of play and return about £9.65 on average at 96.46% RTP. Because volatility is high to very high, most batches will return less than that, and a small number will return much more. With 10x wagering on winnings, the average value drops to about £6.23, and the chance of the balance running out first is significant. See is 100 free spins good for comparisons.
Are there Hellcatraz free spins with no wagering?
Not from our partners, none of which names Hellcatraz. PlayOJO's 80 no-wagering spins are on Big Bass Bonanza, and Coral and Ladbrokes give no-wagering 10p spins on selected games listed in each promotion. If another licensed casino offers spins on Hellcatraz, check whether winnings are paid as cash and whether there is a cap. Our which casino has no wagering answer lists the partner options.
Can I get Hellcatraz free spins with no deposit?
It's unlikely. None of our partner casinos offers a no-deposit bonus, and UK-licensed no-deposit spin offers on a specific slot are rare. When they appear, they tend to be small, capped and need identity checks before withdrawal. Offers from unlicensed sites carry no UK protection. Our page on no deposit bonus codes explains what genuine offers look like and what to avoid.
Is Hellcatraz too volatile for a free spins offer?
It depends on what you want. The average return of promotional spins is the same whatever the volatility, but on Hellcatraz most batches fall below that average while a few go far above it. If an offer has wagering or a low winnings cap, high volatility tends to work against you. If you prefer steadier results, a lower-volatility slot may suit better. Our guide on how to choose slots for free spins explains the trade-off.
Can I use Coral or Ladbrokes free spins on Hellcatraz?
Only if Hellcatraz appears in the promotion's list of selected games, so check the offer page before opting in. Both give 10p spins with no wagering after a qualifying £10 slots bet or spend, but the game list is set by each promotion and can change. You can't move the spins to another slot. See Ladbrokes eligible games for how these lists are presented.
Can you buy the Hellcatraz bonus in the UK?
No. Feature buys aren't offered on slots at UK-licensed casinos, so the free spins feature can only be reached through normal play. Other UK rules also shape the game: no autoplay, no turbo or slam-stop, a minimum of 2.5 seconds per spin and stake limits of £5 for players aged 25+ and £2 for those aged 18 to 24. See UK slot game design rules for dates and details.
Gambling can be addictive. Free, confidential help is available 24 hours a day from the National Gambling Helpline on 0808 8020 133. Visit GamCare.org.uk and GamCare, or block yourself from all UK-licensed gambling sites with GAMSTOP.
This site contains adverts. We may earn commission when you sign up through our links. Advertiser disclosure.
We use no tracking cookies. We store one item in your browser to remember this notice. Casino sites may set their own cookies after you follow an advert link. Cookie policy
