Iron Bank slot review

Iron Bank slot in numbers

Relax Gaming, the Malta-based studio behind the Money Train series, released Iron Bank in 2020. It is a bank-robbery game with a simple grid and a lot of multiplier potential packed into its wild reels. Relax holds a Gambling Commission licence (account 37462) and supplies its games to UK casinos. See our Relax Gaming slots page for the studio’s background, or go back to the slots hub for more reviews.

We take these specs from the developer’s published figures as reported by OLBG’s Iron Bank listing (opens in a new tab) and Slotcatalog (opens in a new tab). Always confirm the RTP in the game at your casino.

How the features work in Iron Bank

Mystery symbols

Mystery symbols land on the reels in the base game and then reveal as a matching symbol, which can turn a near miss into a connected win across several reels. Our page on mystery symbols explains how the reveal is decided and why it is already part of the RTP.

Full-reel wilds with multipliers

Reels 2, 3, 4 and 5 can turn into full wild reels. Each wild reel carries a multiplier from 2x to 10x. The key detail is that when more than one wild reel joins the same win, their multipliers multiply together rather than adding up. That one rule is the reason the game can reach a cap close to 50,000x.

Free spins with three modes

Three or more bank vault scatters trigger free spins, and you pick one of three modes. Mystery Symbols makes the mystery symbols sticky, so they stay put through the round. Expanding Wilds brings wild reels with respins and rising multipliers. Multiplier Collect uses coconut symbols that raise each reel’s wild multiplier as they are collected. The help screen gives spin counts and exact values for each.

Why Iron Bank’s wild multipliers grow so fast

Adding and multiplying give very different results once three or four numbers are involved. The table shows what happens when wild reels with different multipliers all join the same win, using the 2x to 10x range from the game description.

Four wild reels at 10x would multiply a win by 10,000. Those combinations are extremely rare, and the paytable values are set so that the overall return still lands at 96.2%. That is what high volatility looks like in practice: most of the time the multipliers are small or absent, and a large share of the game’s return sits in a handful of very unlikely outcomes. Our guide to slot multipliers covers the difference between additive and multiplicative designs.

Choosing an Iron Bank free spins mode

The three modes don’t just look different; they spread the round’s value in different ways. Here is how they compare, based on what each one does.

The developer summary we rely on doesn’t say whether the three modes share the same RTP, so check the help screen if that matters to you. Whichever you choose, the round can’t change the long-run cost of the game, and no choice turns it into a positive bet. Our guide to expanding wilds explains the most common of the three mechanics.

Iron Bank RTP and what it costs per hour

At 96.2%, Iron Bank returns £96.20 for every £100 staked over the very long run, so the average cost is £3.80 per £100. Here is that edge applied at different stakes and paces.

These are averages over huge numbers of spins. Because the game is high volatility, a real hour might cost the whole session budget or return a feature win well above it. Use our house edge calculator to plug in your own stake and pace, and our theoretical loss guide for the reasoning.

Iron Bank on a £20 budget

£20 covers 200 spins at 10p, 40 at 50p and 20 at £1 before any wins come back. With a game this swingy, 20 spins is a very short sample: there is a good chance of seeing no wild reels with big multipliers at all. At 10p, the same money gives ten times as many spins for the vault scatters to land. If you want to see the free spins modes, smaller stakes give you a much better chance of reaching them within your budget. Our page on low-stakes play explains the trade-off between stake size and session length.

Iron Bank max win: 49,999x in pounds

Among Relax Gaming titles, that sits alongside Money Train 2 at 50,000x and Hellcatraz at 51,840x, and below Money Train 3’s 100,000x. The figure is a ceiling that very few spins ever approach. Our explainer on what a max win cap means covers how a game ends a round once the cap is reached.

Playing Iron Bank step by step

1. Complete age and identity checks at a UK-licensed casino; demo play also needs age verification.
2. Open Iron Bank and check the RTP shown in the help screen, plus the scatter rule and the three modes.
3. Choose your stake: up to £5 a spin at 25 or over, up to £2 at 18 to 24.
4. Spin manually. Watch reels 2 to 5 for full wild reels and their multipliers.
5. When three or more vault scatters land, pick Mystery Symbols, Expanding Wilds or Multiplier Collect.
6. Track the net spend and time display, and stop at your pre-set limit.

Iron Bank and the UK slot rules

Iron Bank must follow the same British rules as every online slot. The stake caps of £5 (25 and over, from 9 April 2025) and £2 (18–24, from 21 May 2025) come from the Gambling Commission’s online slots stake limit guidance (opens in a new tab). The 2021 design rules mean no autoplay, a minimum of 2.5 seconds per spin, no turbo or slam-stop, and no celebration of a return that doesn’t beat your stake.

Since a Gambling Commission warning in January 2020, feature buy-ins are not offered to British players, so the free spins modes can only be reached by landing the scatters. More detail is on our UK feature buy and game design rules pages.

Relax Gaming slots like Iron Bank

Fans of heist themes can also browse our crime and heist slots collection.

Where to play Iron Bank, and how the offers fit

These partner offers are slot offers, but their spins are locked to Big Bass Bonanza or to each casino’s selected games, so Iron Bank may not qualify. Check the casino’s game lobby for the game itself. 18+ and terms apply.

• PlayOJO: new UK customers outside Northern Ireland get 80 free spins on Big Bass Bonanza with a first deposit of at least £10; spins are 10p each with no wagering and winnings are paid as cash. Not available with other offers.
• Coral: after a qualifying deposit, bet £10+ on slots for 100 free spins on selected games at 10p each. You have 48 hours to accept and 7 days to use them, and winnings carry no wagering. Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards don’t qualify.
• Ladbrokes: deposit and spend £10 on slots to get 50 free spins a day for 10 days (up to 500), 10p each, on selected games. Claim by 23:59 each day; each batch lasts 7 days with no wagering. Deposits by prepaid card, PayPal, Paysafe, Neteller, Skrill or Moneybookers are excluded.

Coral and Ladbrokes are run by the same company, LC International Limited, so new accounts at both may not be allowed. Our welcome bonus guide compares offer types.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.