Zombie Road Slot by Peter & Sons

Five survivors hunker below the grid, each one holding a multiplier box that starts at x1. Those aren't cosmetic. Every wild that lands on a reel bumps that reel's multiplier up by 1, and a Double Wild adds 2 instead. A third type, the Random Wild, scatters +1 across multiple reels at once. Wins passing through a reel use whatever multiplier it's accumulated that round, and since cascading wins keep the reels active through consecutive drops, a single spin sequence can stack multipliers several times before the round ends.

Base game resets them all back to x1 after each round resolves. Free spins don't. Land 3 scatters for 7 spins, 4 for 9, 5 for 11 - and every multiplier built during those spins carries forward until the round is over. Each additional scatter during the bonus adds 1 more spin, though the round won't retrigger from scratch. The ceiling sits at 20,000x, and the math to get there runs straight through persistent multipliers stacking across all five reels simultaneously. For 100x you can buy into 7 guaranteed spins; 200x randomizes the count between 7 and 11. A Golden Bet option at 1.2x your stake doubles the scatter trigger rate without touching payout values.

Cartoon post-apocalypse done in dusty pinks and muted greens - wrecked vans half-swallowed by overgrowth sit on both sides of the grid, oil barrels and tires piled up around the survivors' makeshift barricade. The zombie symbols are the premium pays: a purple octopus-like creature, a green pitchfork-wielding ghoul, an orange flaming one, plus a blue zombie rounding out the top tier. Card suits in flat grey and blue fill the lows. Only one wild type appears per spin, so you won't see a Double Wild and a Random Wild on the same cascade. And if a wild is still sitting on the grid when the last cascade fizzles out with no win, it sometimes detonates on its own - clearing the symbols around it, dropping new ones in, and giving the round one more shot at connecting.