Quick verdict: Money Train 4: The Last Stand is Relax Gaming's franchise-closing entry in one of the most decorated slot series of the last decade, swapping the steampunk train for an off-world, futuristic setting while keeping the Money Cart Bonus formula that made the series famous. The base grid grows to 6x6, more than 20 modifier symbols can appear in the bonus round, and the ceiling sits at a series-record 150,000x stake. At 96.10% RTP and a volatility Relax itself rates 5 out of 5, it's built for players who already understand the Money Train format and want the biggest, most feature-dense version of it yet.
The Story
The Money Train series began in 2019 as a steampunk heist through a post-apocalyptic wasteland, with a rotating cast of bandits — the Collector, the Payer, the Sniper, the Necromancer — riding the rails and robbing the titular armoured train. By the time Money Train 3 arrived in 2022, the crew's story had racked up billions of spins and a shelf of industry awards. Money Train 4 was marketed by Relax Gaming as "The Last Stand": the final chapter, in which the crew is pushed off-world into a more futuristic, sci-fi-tinged setting for one last job. Relax's own framing leaned into "more grit than gaming has ever seen," positioning the release as a send-off rather than just another sequel. (Relax has since revisited the well with Money Train 5, but at launch this was billed as the series' closing statement.)
Theme, Gameplay & Symbols
Money Train 4 is the first game in the series to move off the familiar 5-reel, 40-payline layout and onto a 6x6 scatter-pays grid — 36 positions in total, with no fixed paylines. Wins are formed by landing a minimum of 8 matching symbols anywhere on the grid for the two top-paying character icons, or 10 matching symbols for the remaining paying symbols. There are no traditional wilds; instead, the low-paying suits (spades, hearts, diamonds, clubs) sit alongside a set of high-paying character and scatter symbols that carry the visual weight of the game, in keeping with the series' established look.
The base game isn't just a lead-in to the bonus round, either. A Respin feature can trigger randomly on any spin: the game identifies the symbol with the most positions filled on the grid, locks it in place, and clears everything else. Respins then continue — with only that locked symbol, blank spaces, and multiplier symbols able to land — until no more multipliers or matching symbols appear, at which point the total win is multiplied by the accumulated total and paid out. It's a meaningful step up in base-game engagement compared to a lot of scatter-pays competitors, where the base grid is mostly a placeholder between bonus triggers.
Presentation & Sound
Visually, Money Train 4 trades the earlier games' grimy steampunk train carriages for a colder, more mechanical, sci-fi backdrop — think exposed piping, industrial lighting, and a control-panel framing around the reels that reinforces the "final job" tone. It's a clear evolution of the series' house style rather than a reinvention: the UI layout, symbol silhouettes, and Money Cart Bonus screen are all instantly recognisable to anyone who's played Money Train 2 or 3, just rendered with sharper lighting and more elaborate animation on big multiplier hits. Sound design leans into layered mechanical stings and rising musical tension as multipliers stack during the bonus round, which is standard territory for a high-volatility flagship release but well executed here — the audio ramps convincingly as a Money Cart round builds toward a big result, without becoming repetitive across a long session.
How to Play Money Train 4
- Set your stake using the bet selector — Money Train 4's published range runs from around 10p up to £6 per spin, though the exact minimum and maximum can vary by operator and by UK regulatory stake limits, so check the in-game panel before you play.
- Spin the 6x6 grid. Wins pay when 8 or more matching top-tier symbols, or 10 or more matching lower-tier symbols, land anywhere on the grid — there are no paylines to track.
- Watch for the random Respin feature in the base game: if it triggers, the most common symbol on the grid locks in place and further spins add multipliers until the respins end.
- Land 3 or more Bonus scatter symbols to trigger the Money Cart Bonus, which opens on an expanded grid and fills with the series' modifier symbols (Collector, Payer, Sniper, Necromancer, Arms Dealer, and more).
- Where an operator offers it, a bonus buy option can take you straight into the Money Cart Bonus for a fixed multiple of your stake, with a separate, pricier option for a guaranteed persistent modifier at the start — not something UK players will see, per the note below.
- The bonus round plays out with the grid gradually filling; when there's no room left to fill, the round ends and the accumulated multipliers apply to your total bonus win.
Features & Mechanics
The headline feature is the Money Cart Bonus, triggered from Bonus scatter symbols in the base game or purchased directly via bonus buy. It's the same core idea as previous Money Train entries — an expanding grid gradually fills with modifier symbols that boost each other — but Money Train 4 pushes the roster to more than 20 distinct modifiers. Recurring series favourites are back, including the Collector (gathers nearby values), the Persistent Collector, the Sniper (which doubles the value of another modifier), and the Necromancer (revives previously used modifiers). Money Train 4 layers in new mechanics on top: the Upgrader converts a modifier into its persistent version mid-round, the Unlocker reveals additional grid rows to create more room for modifiers to land, the Reset feature refills the bonus round's spin counter, and the Arms Dealer distributes extra modifiers onto the grid when Bonus symbols land during the round.
Where an operator makes it available, the Money Cart Bonus can be bought directly: a standard bonus buy costs around 100x stake and guarantees entry into the round, while a pricier persistent bonus buy — around 500x stake — guarantees the round starts with at least one Persistent Payer, Persistent Collector, or Arms Dealer already active, which meaningfully raises both the volatility and the win ceiling of that individual round. Relax Gaming publishes a higher RTP of 96.50% for the bonus-buy configuration versus 96.10% for the base game, reflecting the different risk/reward profile of paying for direct entry. This is not something UK players will see in practice: the UK Gambling Commission's remote technical standards have prohibited bonus buy features at UKGC-licensed casinos since 2019, so no legally operating UK site can offer it — it's included here only for completeness on how the game is configured in other markets.
Volatility & Win Potential
Money Train 4 carries a base RTP of 96.10%, rising to 96.50% on the bonus-buy configuration where offered — always worth a quick check on the in-game info screen, since individual operators can run a lower-RTP build. Relax Gaming rates the volatility 5 out of 5 on its own scale, its highest tier, and the published hit frequency is 20.14%, meaning a winning combination lands on roughly one spin in five, though the size of those wins varies enormously between the base game and a fully-loaded Money Cart Bonus. The maximum win is 150,000x your stake — a series record for Money Train and one of the highest ceilings Relax Gaming has published for any of its titles — reached only through an exceptional run of stacked modifiers in the bonus round, matching the 150,000x ceiling Nolimit City set on its own extreme-volatility flagship San Quentin xWays. Wins anywhere near that ceiling are inherently rare on a slot rated this volatile; most sessions will see long stretches without a bonus trigger, punctuated by the occasional Money Cart round that can range from modest to substantial.
Pros & Cons
- Pro: A genuinely engaged base game via the Respin feature, rather than a bare holding pattern before the bonus.
- Pro: Over 20 Money Cart Bonus modifiers give the series' signature feature more depth and variety than any previous entry.
- Pro: A series-record 150,000x max win ceiling and a well-documented 96.10% RTP.
- Con: At 5/5 volatility and a 20.14% hit frequency, dry spells in the base game are long and expected — this is not a slot built for steady, frequent wins.
- Con: The sheer number of modifier symbols to learn (20+) makes the Money Cart Bonus considerably harder to follow at a glance than a simpler bonus round, especially for newer players.
- Con: The bonus buy option Relax Gaming publishes for this game is not available to UK players under any circumstances, since UKGC rules prohibit it outright.
Final Verdict
Money Train 4 does what a franchise finale should: it keeps everything that made the series a repeat award-winner — the Money Cart Bonus, the modifier-stacking chaos, the huge multiplier ceiling — and pushes each of those elements further than any previous entry, from the 6x6 grid to the 20-plus bonus modifiers to the series-record 150,000x max win. It's not a slot for players who want frequent, steady returns; the 5/5 volatility rating and 20.14% hit frequency mean it plays like the high-stakes closer it was marketed as. For players who already enjoy the Money Train format and want the most feature-dense version of it, though, this is a strong, well-produced send-off — and a demo run is a sensible way to get a feel for the Respin and Money Cart mechanics before betting real money.
