Infective Wild Slot by Pragmatic Play

The signature mechanic here is in the name - wilds don't just substitute, they infect. When a wild pumpkin lands next to a cat or raven symbol (the two highest-paying icons), those symbols transform into additional wilds. In the base game this creates occasional chain reactions across the 5x5 grid's 40 paylines. During free spins, it gets more aggressive.

The free spins trigger is unusual. Landing three or more scatters doesn't award a fixed number of spins. Instead, eight mini reels appear, each spinning independently to award zero to three free spins - so the total ranges from a disappointing zero (rare) to a generous 24. Once the round starts, every wild that lands stays locked in position for the remaining spins. And since these sticky wilds still carry the infective property, they keep converting adjacent cats and ravens into wilds on every subsequent spin.

The practical effect is a grid that progressively fills with wilds as the round continues. Early spins might produce one or two sticky wilds, but by spin 15 or 20, large sections of the grid can be permanently wild. No ante bet is available - just a straight 100x buy option to skip into free spins directly. The 5,000x cap sits at the high end for a payline-based slot, reflecting how the spreading mechanic can theoretically cover most of the grid.