Hellcatraz

Provider

Relax Gaming

Default RTP

96.46%

Volatility

Very high

Maximum win

51,840x

Core mechanic

Multiplier symbols

What Hellcatraz is

Hellcatraz is Relax Gaming's prison-break slot, presented in deliberately retro 8-bit graphics. Six reels, up to 46,656 ways to win, cascading reels, and a maximum win of 51,840x your stake.

Its structure is unusual: the game offers three different ways to play, each with its own published return figure. That makes it one of the few titles where the choice you make before spinning has a documented, quantified effect on the price you pay.

Three published RTPs for three ways to play

How you play	Reported return	House edge	Cost per $1,000 staked
Mixed mode	96.30%	3.70%	~$37
Lockdown mode	96.46%	3.54%	~$35
With Buy Feature	96.83%	3.17%	~$32

A separate source lists the buy figure at 96.88% against a 96.46% main game, which is consistent in shape if not in the exact decimal. Either way the pattern is the same: the buy is the best-priced route, and the modes differ by roughly half a percentage point end to end.

Which mode is best value

On the published figures the ordering is clear, but the practical answer depends on your market and your budget.

• If buys are available and budgeted — the buy route is the best-priced at 96.83%. Convert the price to cash first and decide the purchase count in advance.
• If buys are prohibited — as in the UK — lockdown mode at 96.46% is the better of the two base routes.
• Mixed mode at 96.30% is the most expensive way to play the game, which is worth knowing before you default to it.

Half a percentage point is roughly $5 per $1,000 staked. Not dramatic, but it is free money for a decision that takes no effort.

Blocks, Power Ups and the grid

The grid begins obstructed by blocks, and clearing them is the game's central activity.

• Cascading reels remove winning symbols, with successive cascades awarding special mystery symbols.
• Power Ups destroy blocks along horizontal and vertical lines, opening positions.
• Lightning win and fire transform blocks activate their own features when unlocked.

The design is close in principle to Temple Tumble Megaways from the same studio — an obstructed grid that opens up as you win — but executed with more feature layers and a considerably larger ceiling.

The multiplier that rises by 3

The free spins round carries a multiplier that increases by 3 every time you clear all blocks on the grid.

That is an unusually aggressive step. Most multiplier trails climb by 1 per event; rising by 3 means a round with several full clears escalates quickly — and it is the mechanism behind the 51,840x ceiling.

It also explains the volatility. Full clears are demanding, so most rounds see the multiplier rise once or twice. A round with four or five clears is a different game entirely, and those are rare by design.

46,656 ways explained

46,656 is 6 to the power of 6 — six reels of six symbols each at full expansion. As with the 7,776x on Temple Tumble, the precision of the figure tells you it falls out of the maths model rather than being chosen for marketing.

And as with every ways-to-win game: the paytable is scaled to the count. More ways does not mean better odds. What the expansion genuinely does is increase win frequency within that sequence, which matters because of the multiplier attached to it.

The published numbers

Statistic	Figure
Return	96.30% mixed / 96.46% lockdown / 96.83% with buy
Maximum win	51,840x
Volatility	Very high
Ways	Up to 46,656 (6⁶)
Free spins multiplier	Increases by 3 per full block clear

The 51,840x ceiling

51,840x places this among the larger ceilings in the Relax catalogue, though below the Money Train series' upper entries.

No max-win probability is published. For scale, the only two published probabilities we have found across eighty-five games are Push Gaming's Retro Tapes at 1 in 1,248,439 for a 10,000x ceiling, and Nolimit City's Karen Maneater at 1 in 330,000 for 11,757x.

A 51,840x ceiling sits well beyond either. Treat it as a description of the variance rather than a target — the realistic proposition is a feature-dense cascading game with a well-designed multiplier structure.

The 94% alternative version

Beyond the three modes, Relax titles commonly circulate in a reduced build around 94%. That is a separate reduction stacked on top of whichever mode you choose.

To check: open the Paytable and scroll to the Game Rules at the bottom, where Relax places the figure. Confirm both the overall return and, if the game displays them, the mode-specific figures.

Stake sizing in practice

• Budget 300 to 500 base spins — the published guidance for extreme-volatility Relax titles.
• Choose your mode deliberately rather than defaulting. The difference is documented and free to act on.
• Check the build in the Game Rules before your first spin.
• If you buy, count each purchase at its full spin equivalent.
• Take a large result off the table — a round with multiple full clears will not repeat soon.

Where this fits in a session

Hellcatraz is a genuinely inventive game — the 8-bit presentation is distinctive, the block-clearing gives every sequence visible progress, and the multiplier structure is one of the more aggressive on this site.

It is also very high volatility, so treat it as a deliberate session on a decided budget rather than a base-layer game. If you want a Relax title to sit at for hours, Marching Legions at 98.12% is the arithmetic answer.

Common misconceptions

The first is that the three modes are cosmetic. They carry different published returns and one is measurably better priced than the others.

The second is that 46,656 ways improves your chances. The paytable is calibrated to it.

The third is that clearing blocks builds toward something across spins. Progress resets — the multiplier climbs within a round only.

Who this suits

This suits a very high variance player who enjoys feature-dense cascading games and appreciates a studio publishing separate figures for each way of playing.

It suits poorly small budgets, and anyone who would default to mixed mode without noticing it is the most expensive of the three routes.

FAQ

Why games offer modes at all

Hellcatraz's three separately priced modes are unusual enough to be worth a general explanation, because the practice is spreading.

A studio building one maths model can expose several entry points into it — a base game, an ante-style enhanced bet, a buy. Each has its own cost structure, and each therefore has its own return figure. Nolimit City does this across its catalogue, publishing separate percentages for base play, each bonus mode and each buy tier.

What matters for you is that these figures are usually published and rarely equal. On this game they span roughly half a percentage point; on Money Train 2 the gap between base and buy is a full 1.6 points.

The habit worth building: when a game offers you a choice before spinning, look for a return figure attached to each option. If they are published, the decision is free money. If they are not, ask why.

Counting spins on a cascading game

Hellcatraz uses cascading reels, and that changes how a session should be measured.

One press of the button can produce a chain of five or six resolutions, each with its own win, animation and sound. The result is that a spin feels like several spins, which makes it easy to lose track of how many you have actually played — and the spin count is what your budget is denominated in.

The chain also creates a sense of momentum during losing sequences: symbols keep clearing, blocks keep breaking, and it reads as progress even when the balance is falling. Count button presses, not events, and decide the count before you start.

Who Relax Gaming actually is

Worth a short section, because the studio's structure explains a lot about the catalogue's inconsistency.

Relax Gaming was founded in Malta in 2010 and acquired by Kindred Group in July 2021 in a deal valued at roughly $350 to $380 million. It operates as both a game developer and an aggregator — its platform distributes thousands of titles from third-party studios alongside its own in-house releases.

Their in-house output — the Money Train series, Hellcatraz, Temple Tumble, Iron Bank — is recognisable: high volatility, feature-led design, and a consistent habit of publishing separate return figures for different modes and buys, which is more transparency than most studios offer.

51,840x in the studio's range

Game	Ceiling	Return
Money Train 4	150,000x	96.10%
Money Train 3	100,000x	96.10%
Hellcatraz	51,840x	96.46%
Iron Bank	46,000x	96.20%
Marching Legions	10,000x	98.12%
Temple Tumble Megaways	7,776x	96.25%

Read the table top to bottom and the relationship is almost perfectly inverse: as the ceiling falls, the return rises. Marching Legions at 98.12% has a fifteenth of Money Train 4's ceiling, and Temple Tumble's 7,776x buys a livelier base game.

Note also that 51,840 is 6⁵ × 6.67 — not a round marketing number but a figure calculated from the maths model, the same signature as Temple Tumble's 7,776x (6⁵).