Action Bank Slot by Light & Wonder

The setting is a polished metallic vault interior, all brushed steel rivets and overhead lighting, with the title plate bolted to the wall like signage above a real bank counter. The reels themselves sit inside a steel cabinet frame, and the symbols on a base spin are unusually pared back - red Xs, white Os, single and double BARs, and a jester-style joker Wild. That bare-bones reel set is the Barcrest pub-slot heritage showing through, before the heist machinery on top kicks in.

This is the original Action Bank, the title the rest of the Light & Wonder series spun off from. The hook lives in the Lock symbol - when one lands, it sticks to its position for the following spin instead of clearing. Build up several Locks and you're effectively spinning with a partial board already filled, which is where the higher-tier wins start coming from. Pair that with the Alarm symbol, a special-pay icon that fires its own siren win event when it shows up, and the base game gets noisier than the empty Xs and Os make it look.

Three or more scatters open the Free Spins round, and this is where the gem premiums on the title plate - Sapphire, Diamond and Ruby - come into play. The bonus area moves to the vault interior and adds a Gem Shuffle re-arrangement plus a Pick Me stage where you choose a safe to crack open for a prize. Each free-spin win can be sent to the Gamble round, an old red-or-black double-up that's standard UK arcade fare, and extra spins can be tacked on mid-feature rather than only at the start.

Wins cascade through four celebration tiers before hitting Big, Super and Mega Win banners, with the headline figure capping at 675x your stake from a fully extended Free Spins run (base game tops out closer to 500x). Bet range stretches from a single cent up to $400 per spin, marking this as the high-roller cut of the series rather than the $10-capped Safe Cracker sibling. No ante bet, no confirmed buy-bonus shortcut - the route to the vault is the scatter and nothing else.