Money Train 3 Slot by Relax Gaming

Money Train 3 is built around its bonus round - the base game exists mostly to get you there. The 5x4 grid sits inside a battered steampunk locomotive, all rusted iron plating and copper pipework, with desaturated browns and orange interior lighting against a post-apocalyptic skyline. Four gangster character portraits stack as high-pay symbols, with A-K-Q-J royals filling out the lows. Land 3 or more Bonus symbols and the entire base paytable gets stripped away: only Bonus, Special Bonus, and Blank tiles can land from then on.

The Money Cart bonus starts with 3 spins. Each new symbol that lands resets the counter back to 3, so the round lasts as long as you keep collecting. Standard Bonus symbols reveal a value between 1x and 10x bet. The thirteen Special Bonus symbols are where it gets interesting. Snipers double the values of 3 to 8 other symbols. Tommy Gun Snipers double one random symbol's value 2 to 6 times. Collectors absorb every visible value into themselves. Collector-Payers pick 3 to 5 targets, swallow their values, then pay their boosted total back to each one. Necromancers revive 2 to 7 already-used non-persistent specials, and the same symbol can be revived multiple times in a single round.

Then there are the persistent versions, which keep acting on every spin until the bonus ends. The standout is the Persistent Shapeshifter - it transforms into a different special symbol each spin (Collector, Collector-Payer, Sniper, Tommy Gun Sniper, or Tommy Gun Payer) and performs that action. Fill any column with symbols and the grid opens an extra row, going from 5x4 to 5x5 to 5x6 over two possible expansions per round. Hit 100,000x of accumulated value and the round ends instantly with the cap paid.

The base game has its own Respin Feature that randomly fires after non-winning spins - a symbol locks, everything else respins, and only that symbol, blanks, or +1x/+2x/+3x multipliers can land. Multipliers don't stick, they accumulate to a single total applied to the final win when the feature ends. It's a small consolation between bonus hits, but in a high-variance game where dry stretches are the norm, every drip helps.

The Buy Feature has four tiers. The 1 Spin entry costs 20x bet but resets the counter to just 1 each new symbol, so it's brutal. The 2 Spin tier at 50x sits in the middle. The 100x Original mirrors a natural trigger with full 3-spin behavior. The 500x Persistent guarantees a Persistent Shapeshifter, Collector, Sniper, or Collector-Payer in the round - the only way to lock in a persistent special on demand. Money Train 2 set the template; this one expands the special-symbol roster and adds the column-expansion mechanic on top.