Legacy of the Wild Slot by Playtech

One spin here can pay several times over. Every win explodes the symbols that formed it and drops a fresh wave into the gaps, and if that new wave pays too, it clears and drops again. Down the left edge a column of crystals, the Wave-O-Meter, lights one level higher for each consecutive wave win in a spin, climbing 8, 10, 15, 20, 30, 50. Reach five waves in a row and the free games open, with longer chains handing out more spins, up to fifty for the greediest run.

The thing keeping those chains alive is the red Book of Wilds. It sits quiet for the first two waves, then starts spreading parchment WILD scrolls out to the tiles beside it, and the deeper into a chain you go, the further it reaches, up to four adjacent positions seeded at once. Those scrolls are the top payer and stand in for every character symbol, so the grid turns more wild-heavy exactly as the wave count builds toward a free-spins trigger. The two features feed each other.

No scatter sits anywhere on the reels. The free games come purely from stacking consecutive wave wins, so the base game and the bonus run on one mechanic instead of switching to something new. No bonus buy either, and no jackpot. What you do in a normal spin is what you do in free spins, just more of it.

The reels sit inside a candlelit alchemist's study, dark stone walls, red velvet drapes, a bookshelf and a purple cauldron bubbling in the corner next to a half-melted candle. Symbols lean on fantasy stock: a young purple-potion mage, a red-hooded sorceress, a bearded wizard, a blue horned demon knight and a green tusked orc, above coloured crest gems. This is the original. The 2020 follow-up, Legacy of the Wild 2, stretched the same wave idea onto a taller grid with more lines.