Relax Gaming slots

Quick Verdict

Relax Gaming spreads across the whole variance spectrum rather than committing to one style, which makes it harder to summarise than a pure high-volatility house and means no single label fits its catalogue. The studio was founded in 2010, holds a UK Gambling Commission software licence directly, and runs over 100 proprietary slots alongside a large third-party aggregation business. Its signature mechanic is the Money Cart hold-and-win from the Money Train series, sitting beside the proprietary Dream Drop progressive jackpots. Top-tier RTPs typically sit near 96.5%, but the catalogue reaches an outlier 99% on Book of 99 and drops to roughly 90% on the lowest operator variants — a wide band that rewards checking the active setting. Max wins run from a few thousand times bet up to 150,000x on Money Train 4. Against Push Gaming, the closest comparator, Relax offers more range and a higher ceiling but a less consistent house identity.

Studio at a Glance

Studio Overview

Relax Gaming was founded in 2010 by Patrik Österåker and Jani Tekoniemi, initially as a technical supplier of gaming solutions before its proprietary slot studio took shape from around 2018. It is registered in Malta, with a head office in Sliema and development studios across Sweden, Serbia and Estonia. Ownership has changed twice: Kindred Group, an investor since 2013, completed a full buy-out on 1 October 2021 valuing the business at up to €320 million, and Kindred itself was then acquired by the French group FDJ (now FDJ United) in a takeover that completed in October 2024. Relax sits within that group as a distinct entity, so its ultimate parent today is FDJ United, via Kindred, rather than an independent Kindred as some older sources still state.

On regulatory standing, Relax Gaming Limited holds its UK Gambling Commission licence directly under account number 37462, covering remote gambling software, casino and bingo, and a Malta Gaming Authority Critical Gaming Supply licence numbered MGA/B2B/246/2013. Its RNG and game maths are independently tested by eCOGRA, named on the studio’s own certification footer, and it holds further licences in Gibraltar, Romania, Sweden, Greece, Ontario and Pennsylvania. RTP and volatility are not displayed on Relax’s public product pages, which show max win and bet range only; players verify the active RTP in the in-game information panel at each operator.

What distinguishes Relax is dual identity. It is both a game maker and an aggregation platform: its Silver Bullet and Powered By programmes distribute over 7,000 third-party games to 900-plus operator brands, which no pure studio rival replicates. Within its own output, the range is unusually wide — the Money Train heist series and Dream Drop jackpots sit alongside 99% and 98% RTP titles that most studios never attempt. The limitation is coherence: because Relax spans medium to very high volatility and every theme going, players seeking a single dependable house style will find it less predictable than a focused studio, and the aggregated catalogue can blur where Relax’s own games end. Anyone wanting to play Relax Gaming slots should treat the proprietary titles and the aggregated third-party content as separate things.

Mechanic DNA

Relax is identifiable less by one reel gimmick than by two proprietary systems — the Money Cart bonus and Dream Drop jackpots — layered over grid formats it uses across the catalogue and premium engines it licenses. The mechanics below recur most often and most fully capture how a Relax title tends to play.

Money Cart

The Money Cart bonus is a hold-and-win round on a cleared grid, triggered by three or more Bonus symbols, where special symbols such as Collectors, Payers and Persistents interact to build a single accumulated payout. It anchors the entire Money Train series and its Money Cart spin-offs. Against Hacksaw Gaming’s simpler coin-collect rounds, Money Cart layers more symbol interactions per spin, which raises its ceiling but concentrates nearly all the game’s return into that one feature — base play is mostly a wait for the trigger.

Dream Drop Jackpots

Dream Drop layers a five-tier progressive network — Rapid, Midi, Maxi, Major and Mega — on top of otherwise standard slots, with the Mega tier a must-hit jackpot funded across every operator running the series. It appears in Dream Drop editions of Temple Tumble, Space Miners and others, and Relax reports it has created over 20 millionaires since 2022. Unlike the studio’s feature-buy mechanics, a progressive jackpot is permitted at UKGC operators, so Dream Drop is one of the few Relax features UK players can access in full.

Scatter pays and tumbling grids

Land enough matching symbols anywhere on the grid and the win registers with no paylines, usually followed by a tumble that clears winners and drops new symbols in. This scatter-pays-and-cascade approach drives Money Train 4, Hellcatraz, Cluster Tumble and Iron Bank, among others. It is a format Relax leans on more heavily than most studios, spanning grid sizes from 6×6 up to 8×8. Compared with a fixed-payline studio, the format produces busier screens and chain wins, though on Relax’s high-variance titles the cascades rarely sustain without a bonus, so base sessions still lean quiet.

Licensed premium engines

Megaways and Infinity Reels are the headline licensed engines in Relax’s toolkit: Temple Tumble was Relax’s first Megaways title under the Big Time Gaming licence, and Relax holds the Infinity Reels IP on behalf of its partner studios. Neither mechanic is Relax’s own invention, which is the honest caveat, but few mid-size studios hold this breadth of licensed and owned engine rights, and it flows partly from Relax’s aggregation role and its studio partnerships — giving the catalogue mechanical variety that a single-engine developer cannot match.

Catalogue Map by Series and Franchise

Franchise progression at Relax is clearest in the Money Train series, which raised its ceiling with each entry while keeping the Money Cart bonus as its constant. Max-win figures for the original and Money Train 4 are stated on Relax’s own product pages; the two middle entries are from secondary sources.

The series is a rare example of sequels that improved rather than diluted: each entry raised the ceiling (20,000x to 150,000x) and deepened the Money Cart round, while the top-tier RTP held near 96.1–96.4% throughout. If you have played Money Train 2, the later entries are worth playing for the expanded bonus rather than any RTP gain, and Money Train 4 is the definitive version of the mechanic. Relax has stated the series is now closed at four numbered entries, though Money Cart spin-offs and a Dream Drop version exist.

Best Relax Gaming Slots Ranked

What makes a slot “best” for a studio this broad is less about peak ceiling than about how well each title represents what Relax does that rivals do not. The five best Relax Gaming slots below span the studio’s range, from a 99% RTP book slot to a 150,000x heist. Ranking follows SlotRover editorial order weighted across top RTP, lowest known RTP risk, volatility suitability, mechanic originality, UK availability, max-win ceiling, and data completeness — not a guarantee of player outcomes. RTP and volatility figures are from secondary sources, as Relax does not publish them on its product pages; max wins for Money Train 4 and Book of 99 are dev-published, the others secondary.

Money Train 4

Money Train 4 closes the studio’s flagship series and earns the top position as the fullest expression of the Money Cart mechanic, carrying the catalogue’s highest ceiling. Relax’s own page states a 150,000x max win on a 6×6 scatter-pays grid; secondary sources put the top RTP at 96.10%, rising to 96.50% on the buy, with 94% and 90% variants also in circulation. It is rated very high (5/5). The limitation is bluntness: with the Money Cart holding nearly all the return, base play is a long wait, and the feature buy that shortens it is unavailable at UKGC operators.

Book of 99

Ninety-nine per cent RTP is the reason Book of 99 ranks this high, and Relax markets that figure on its own product page — a rare public RTP claim from this studio. Beneath the headline it is a conventional book slot with a Greek theme, an expanding special symbol and a wild-collection route to free spins, with Relax’s own page stating a 5,000x max win. It is still rated 5/5 for volatility despite the generous RTP, so wins remain uneven. The catch is that the high RTP does not lower variance — long book-hunt stretches still test a bankroll.

Hellcatraz

The cascading prison grid drives Hellcatraz, where each successive cascade awards Mystery symbols that later resolve into matching pays, and collected Keys trigger free spins. Secondary sources record a 51,843x max win and a top RTP around 96.46%, with a separate higher-stake Lockdown mode carrying a different rate. It plays across 46,656 ways with a distinctive 8-bit look. The Limitations-First point is the mode split: the two modes run different RTPs at different minimum bets, and secondary sources do not agree on the exact figures — confirm which mode and RTP an operator runs before committing.

Temple Tumble Megaways

Smash through the temple walls and Temple Tumble’s tumbling reels clear winning symbols to open fresh positions, the mechanic that gave Relax its Megaways breakthrough in 2019. Secondary sources put the max win at 7,767x and the RTP at 96.25%, with free-spin blocks holding extra spins and multipliers across 46,656 ways. It is the most accessible ceiling among these five, which is the point of including it. The trade-off is upside: a sub-8,000x cap is modest by Relax standards, so it suits players wanting steadier Megaways play rather than a large chase.

Marching Legions

Marching Legions is the studio’s high-RTP Roman title, notable for a 98.12% RTP that ranks among the highest in any modern slot catalogue, per secondary sources. It pairs that rate with a cluster-style grid, re-drops and a comparatively restrained 10,000x max win, making it a natural counterpart to Book of 99 for RTP-focused play. The limitation is ceiling once again: the high RTP comes with a lower peak than Relax’s heist titles, and it stays high-volatility despite the rate, so it suits value-minded players who can ride dry spells rather than anyone chasing a headline multiplier.

RTP Configuration Map

Relax Gaming’s RTP handling needs particular scrutiny because, unlike many studios, it does not publish per-title RTP on its own product pages — those pages show max win and bet range only, with Book of 99 (marketed as a 99% RTP slot) the lone exception. Every other top-RTP figure below is therefore from a secondary source or an in-game paytable, not a Relax product page, and each title typically ships in multiple configurations that operators select between. The spread between the top figure and the lowest deployed variant can exceed six percentage points, which materially changes expected loss.

The spread matters directly for expected loss. On Money Train 4, the roughly six percentage-point gap between the 96.10% top variant and a 90% operator variant equates to about £6 in additional theoretical loss per £100 staked at the lower setting — material across any session of length. Where a lowest variant reads “not separately verified,” Relax’s page showed no RTP and research did not confirm a specific lower figure; it should not be read as evidence that lower variants do not exist, since studio-wide practice includes a 94% band and Relax’s own pages display a 90% rate for the German market.

On operator practice, UKGC-licensed casinos choose which configuration to run and are not obliged to deploy the top one. Because Relax publishes no RTP on its product pages, the in-game information panel is the only reliable check — it displays the active RTP at every UKGC-licensed casino, and the loading screen may repeat it. Two casinos carrying the same Relax title can run materially different RTPs, so verifying per operator before staking matters more here than for studios that publish a headline figure.

Volatility Profile

Relax’s variance skew is its least typical trait: rather than concentrating in one tier, the catalogue runs from lower-volatility retro titles such as Epic Joker and Powerspin up to very high, and Relax rates each title on its own 1–5 scale, though these ratings appear in-game rather than on the public product pages. The tiers below use those secondary-reported ratings; where a rating could not be confirmed, the title is left out.

High Volatility

This tier holds Relax’s more approachable notable titles, prized for value in the theoretical return rather than a distant ceiling — though “approachable” is relative, since all three carry high in-game ratings and Book of 99 a 5/5 despite its RTP. Genuinely lighter retro formats such as Epic Joker and Powerspin sit below them. Bankrolls stretch further here than on the very-high heist titles, but dry spells still occur. Against Push Gaming, whose lightest titles also lean high, Relax’s willingness to pair a 98–99% RTP with these formats is the distinguishing trait.

Very High Volatility

This is Relax’s headline tier and the home of its bonus-buy titles, suiting players who accept long dry base-game runs for a large, feature-driven ceiling. The practical safeguard is to keep stakes low enough that a budget can absorb those runs and to set hard limits before playing, since returns arrive in rare bursts through the Money Cart or an equivalent round. Compared with Push Gaming’s high-volatility titles, Relax matches the variance but pushes a higher ceiling, with Money Train 4’s 150,000x topping Push’s 100,000x peak.

Cost of Play at GB Stake Caps

Translating Relax’s RTP profile into player-facing terms is complicated by its width: the same studio spans a 99% book slot and 90% operator variants, so theoretical cost varies more than at most suppliers. The figures below are statistical averages across many hours, not predictions for any single session, and variance produces sessions far above or below them. The two rates used here are portfolio extremes — the highest known RTP across the catalogue and the lowest known operator-deployed RTP, drawn from different titles. They illustrate the spread players may encounter across the studio’s portfolio, not a single playable configuration pair.

Formula: theoretical hourly loss = 600 spins × stake × (1 − RTP), using 600 spins per hour as a standard mobile pace. At the 99.00% top RTP and a £1 stake, the calculation is 600 × £1 × (1 − 0.99) = £6.00. At the roughly 90.00% lowest known variant, the same calculation is 600 × £1 × (1 − 0.90) = £60.00. The 99.00% figure traces to Book of 99; the roughly 90.00% figure is the lowest operator-deployed variant seen across titles such as Money Train, and Relax displays a 90% rate for the German market on its own pages — a player will not encounter both rates in a single session unless they switch titles. Most top-tier Relax RTPs sit near 96.5%, between these extremes.

The width above is the real caution. Because Relax’s catalogue ranges so far, two sessions on different Relax titles can carry an order-of-magnitude difference in theoretical hourly cost, and the studio’s bonus-concentrated high-variance titles mean base-game-only stretches can lose considerably faster than any long-run average shown, while a single Money Cart can return multiples of it.

UK Availability and Compliance

Relax Gaming Limited holds its UK Gambling Commission licence directly under account number 37462, covering remote gambling software, casino and bingo, so it is the licensed supplier itself rather than reaching UK operators only through a third party. A separate Gibraltar entity holds an additional UKGC licence under account 57758. Beyond distributing its own games, Relax also aggregates thousands of third-party titles to UK operators through its Silver Bullet and Powered By platforms, so a UK casino’s “Relax” content may be proprietary Relax slots or partner-studio games carried on its platform.

On bonus buys, Relax’s Money Cart feature-buy options — such as Money Train 4’s Original and Persistent buys — are not available at UKGC-licensed operators, where feature-buy mechanics breach the Commission’s RTS 14A responsible product design requirements. This follows the UKGC’s 17 January 2020 warning on feature buy-in facilities, after which all contacted operators removed the feature, with the Commission’s own published update confirming all six had done so by 17 May 2021 — it is not a “February 2023 ban,” a date that does not match UKGC documentation. Roughly half of Relax’s catalogue carries a bonus buy elsewhere; UK builds rely on natural triggers instead, and Relax does not market a branded ante-bet UK alternative equivalent to some rivals. Progressive Dream Drop jackpots, by contrast, are permitted and do operate at UKGC casinos. UK builds also disable autoplay and turbo under UKGC restrictions on rapid play, with a minimum game cycle of 2.5 seconds under RTS 14D.

On testing and transparency, Relax’s RNG and game maths are independently certified by eCOGRA, named on its own footer, as required before UK release. RTP and volatility are not shown on Relax’s public product pages and must be read from the in-game information panel. Demo play is available under RTS 6, where a same-site demo must mirror the operator’s real-money configuration, whereas a third-party demo aggregator may show a default build rather than a specific operator’s active variant — two distinct things worth keeping separate.

Relax Gaming vs Push Gaming

Push Gaming is the most useful comparator because it is Relax’s closest peer among premium mid-size studios: both are UKGC-licensed, both built reputations on high-variance flagships with feature buys blocked in the UK, and both sit at similar RTP bands. The Push figures below are drawn from Push Gaming’s own catalogue references and reputable secondary data rather than a per-title official sweep, and Push max-win figures vary across sources, so the ranges are framed conservatively.

Relax wins for the player who wants variety from one supplier: a progressive jackpot network in Dream Drop, genuine high-RTP options in Book of 99 and Marching Legions, and the highest ceiling of the two at 150,000x. If the appeal is breadth of experience, or a UK-accessible jackpot chase, Relax is the stronger pick over Push Gaming.

Push Gaming wins for the player who prizes a tight, consistent high-variance identity. Its catalogue is smaller and almost entirely focused, its Mystery Stacks and Razor Reveal mechanics are unusually refined, and its Push Bet gives UK players a compliant way to raise bonus frequency that Relax does not brand an equivalent of. A player who wants dependable high-variance cluster and stack play, rather than range, is usually better served by Push Gaming.

Who Plays Relax Gaming Slots

The player who suits Relax is one who values choice over a fixed house style and sizes stakes to the title in front of them. Because the catalogue runs from medium to very high volatility, the same player might take a longer, steadier session on Book of 99 or Marching Legions and a short, low-stake chase on Money Train 4 — the safeguard in both cases is keeping stakes low enough that the budget absorbs dry runs, and setting hard limits before play. This is a player comfortable browsing Relax Gaming slots online and checking the in-game Relax Gaming RTP each time, since the studio publishes none on its pages, and one who wants a UK-legal jackpot option in Dream Drop.

The player who does not suit Relax is one wanting a single predictable experience. Someone who expects every title from a studio to behave alike will find Relax inconsistent by design — a 99% book slot and a 150,000x heist share little beyond a logo. Feature-buy players in the UK are also poorly served, since Money Cart buys are unavailable at UKGC operators and Relax offers no branded ante-bet substitute.

Between the extremes sits the casual player who can dip in selectively. Temple Tumble Megaways and Marching Legions serve shorter, gentler sessions with more frequent feedback, and any Dream Drop title adds a jackpot angle without a feature buy. What to avoid, if you are not committed to the variance, is the very-high tier — Money Train 4, Hellcatraz and Iron Bank are built for long droughts, and casual play there can burn through a budget quickly.

How This Review Was Verified

Sources were verified in July 2026. Relax Gaming’s own website was the primary source for licensing, ownership and the facts it publishes: the licence-information and certification pages (UKGC account 37462, MGA/B2B/246/2013, eCOGRA), and individual product pages for Money Train, Money Train 4 and Book of 99. A critical limitation is that Relax generally does not display RTP or volatility on its product pages — those mostly show max win and bet range only — so almost every RTP and volatility figure in this review is from a secondary source or an in-game paytable rather than a Relax product page, and is framed as such; Book of 99 is the exception, since Relax markets its 99% RTP directly on the page. Max wins for Money Train, Money Train 4 and Book of 99 are dev-published, while other max wins (Money Train 2 and 3, Hellcatraz, Iron Bank, Temple Tumble Megaways, Marching Legions) are secondary, chiefly OLBG and PokerNews. FDJ’s and Kindred’s own releases confirmed the current ownership chain. Push Gaming comparator figures are from Push’s catalogue references and secondary data. UK operator-level availability was not verified per casino with dated checks, so the “where to play” section is omitted rather than asserted. Players should treat any figure here as point-in-time and confirm the active configuration in the operator help panel before depositing real money. RTP, volatility, stake limits, and feature availability are subject to operator-side updates this review cannot pre-empt.

Responsible Gambling

Relax’s variance is wider than most studios, which is the first thing to internalise: a 99% RTP on Book of 99 sits in the same catalogue as roughly 90% operator variants on high-variance titles, and even the high-RTP games carry 5/5 in-game volatility ratings, so base-game returns can fall well below the headline figure over hundreds of spins. Because Relax publishes no RTP on its pages, the in-game information panel is the only way to confirm what you are playing. Set a budget before play, set a time limit, and use operator deposit limits to hold to both.

In expected-loss terms, at £5 per spin and a representative 96.10% RTP (Money Train 4), about 512 spins would carry roughly £100 of theoretical expected loss; on the lowest known variants near 90%, about 200 spins would carry the same total. That is a long-run average, not a balance-duration estimate — it does not mean a £100 balance will last that many spins, and variance can end a session far sooner. If gambling stops feeling like entertainment, GamStop lets you self-exclude across UKGC-licensed operators, and GamCare runs a 24-hour support helpline on 0808 8020 133. Further information on licensing and player protections is available from the UK Gambling Commission.