The Robbery Slot by Betsoft

The whole game hangs on getting a COIN and a COLLECT symbol onto the reels together. When both show up in the same spin, the Collect Coin feature fires: each COLLECT displays 1 to 6 bullets, and for every bullet it shoots a random Coin somewhere on the grid and stamps a multiplier on it (2x, 3x, 5x, 6x, 8x, or 10x). Once the shooting stops, the COLLECT sweeps up all those boosted Coin values and turns into a single Coin showing the total. Land more than one COLLECT and they fire one after another. Coins carry either a cash value from a fraction of your bet up to 10x, or one of the fixed jackpot tiers stamped on their face, Mini 20x, Minor 35x, Major 100x, or the Grand at 1000x.

Two side mechanics feed off the same symbols. The Vault quietly banks every Coin and COLLECT that lands and has a random shot at dropping extra ones onto the grid, and a Coin landing on an existing Coin merges the two values together. Separately, if a winning combination fills all five reels with Coins and no COLLECT is present, the 5 Reel Coin Bonus rakes every Coin on the board straight into the win meter on top of the regular Betsoft ways pay. Free Spins are where it opens up. Three, four, or five Scatters award 6, 10, or 12 spins, and the reels themselves grow: an Expand symbol adds a row to its reel each time it lands, pushing the base 243 ways up toward 3125 as the grid stretches to a full 5x5. A +1 Spin symbol tops up the counter, and once a reel maxes out any further Expand just hands you another spin instead.

The Buy Bonus sits at 40x and drops you into Free Spins with a random 3, 4, or 5 Scatters, so you're not guaranteed the longer round for your money. One gripe: with the Vault, the coin merges, the shooting COLLECTs and the jackpot Coins all layered together, a busy spin gets genuinely hard to follow, and it's not always obvious what paid what. The setting is a brass steampunk cage bolted inside a bank vault, a giant round safe door behind the reels, gold bars heaped along the floor beneath the jackpot ladder, cast-metal card royals sitting between a red-bandana bandit, a purple-coated cowgirl and crossed revolvers. It's a slick Wild West heist wrapped around a Coin-collect engine, and part of Betsoft's story-driven THE Series.