Frank's Diner Slot by Relax Gaming

Above the reels, four small green panels flash 2x, 3x, 4x, 5x. These are reel multipliers - one per column above reels three through six in the screenshot - and any winning way that touches that reel gets its win multiplied by whatever value is currently active. Multiple multipliers on the same way compound. Catch a winning combination spanning all four boosted reels and you're looking at 2 x 3 x 4 x 5 = 120x on top of the line value.

The other half of the math is split symbols. When a split lands it counts as two or three copies of itself stacked on a single grid position, ballooning the ways calculation - a 4096-ways grid can momentarily evaluate as if it had three or four times that many active ways. The signature feature is the combination of those two systems: split symbols on a multiplier reel.

Setting is post-apocalyptic Americana. A red vinyl-roofed diner sits at the edge of a dusty wasteland highway with a busted blue sedan, leafless trees, and what looks like a small refinery smoking on the horizon behind a burnt-out skyscraper. Frank himself is a tough mechanic biker patron leaning on the counter to the left of the reels in a flannel shirt, with a chrome-handlebar motorbike parked on the right ridden by a hulking masked biker. Symbol set leans cartoon punk: tattooed mohawk biker in a green vest, a bald goggle-wearing patron, fried eggs with hotdogs and steaks for mid-pay food. The metal frame around the reels is studded chrome, and the BONUS REELS toggle hangs off the left as a chunky panel. Free Spins triggers off three or more bonus scatters, with the reel multipliers from the trigger spin sticking through the entire bonus round. Buy Free Spins runs at 60x bet for the same 96.5% RTP as the regular base. Cap is 10,000x, which the multiplier-stacking math can absolutely reach if the right reels light up with split symbols sitting on a 5x boost.