Fortune Hit'n Roll Slot by Pragmatic Play

Every Wild that lands picks a direction - up or down - and starts moving along its reel. Each position it passes through gets a Wild stamp with a multiplier that ticks up by 1x for every step: x1 where it first appeared, x2 on the next spot, x3 on the one after, and so on until the symbol rolls off the edge. A single Wild hitting the middle of a reel produces a column of three or four Wilds with stacked multipliers, all evaluated on that same spin.

Free spins change the equation. Nine rounds begin when three scatters land on reels 1, 3, and 5. The Hit'n Roll mechanic still fires on every Wild, but now the trail stays put for the rest of the bonus. When a second Wild arrives on a reel that already has sticky Wilds, it starts its multiplier sequence from wherever the existing stack left off. A reel with a x3 Wild at the top gets the next Wild starting at x4, then x5, x6 as it rolls. By the end of the round, entire reels fill with Wilds carrying double-digit multipliers.

Wilds only appear on open positions - once a spot is claimed by a sticky Wild, no new one overwrites it. This forces the rolling action onto the remaining gaps, concentrating multiplier growth on fewer positions as the round progresses. The feature cannot retrigger, so those 9 spins are all there is. A 100x buy option skips straight to the bonus with 3 guaranteed scatters.