Train of Riches: Capital Express Slot by Evoplay

Free spins strip the reels down. Card symbols disappear entirely during the 8-spin round, leaving only high-value symbols, Wilds, Scatters, and Bonus coins on the reels. That filter changes the math on retriggering - since Scatters still appear on reels 2-4 without low-value clutter diluting them, landing 3 more for additional spins happens more often than you'd expect. You can buy straight into free spins for 23x or skip them entirely and buy into the Bonus Game for 43x.

The Hold & Win bonus triggers when 6 or more gold coin symbols land in either the base game or free spins. Each coin carries a random multiplier between 1x and 14x bet. You start with 3 respins, resetting back to 3 every time a new coin sticks. Fill all 15 grid positions and the Grand jackpot pays 1000x on top of whatever the individual coins are worth. Mini (30x) and Major (150x) jackpots are also in the pool. There's a neat touch in the base game too - if a spin produces no winning combination but at least one Bonus coin landed on the reels, a random event can drop 5 additional coins onto the grid and force-trigger the bonus.

Visually it's warm amber reels inside an ornate gold frame, a steam locomotive piled with coins sitting above the grid, all set against a cold blue mountain valley with pine forests. The high-pay symbols are money bags, steel vaults, diamonds, and stacked gold coins - everything fits the heist-train aesthetic. If you've played Cycle of Luck you'll recognize the Hold & Win skeleton, but the filtered free spins and the random bonus trigger in the base game add two extra paths into the bonus round that Cycle of Luck doesn't have.