Pirate Stuff Slot by Onlyplay

The free spins mechanic here works differently from most book-style games. When the bonus triggers, every symbol that lands in a winning combination becomes "special" for the rest of the round. On the next spin, if another symbol type wins, that one joins the special pool too. The special set keeps growing with each winning spin, and these expanding symbols follow their own payout rules separate from the normal paylines. So early wins compound into later wins - the longer the round runs, the more loaded the symbol pool gets.

Wild is a treasure chest marked "WILD" that only appears on reels 1, 2, and 3. Three of them anywhere on those reels trigger 10 free spins, and landing another three during the bonus adds 10 more. That left-side-only restriction means you're watching just three reels for your trigger, which makes near-misses with two Wilds on reels 1-3 and a third barely off to the right a constant feature. Book of Pinata and Mystery of Persia run on the same engine with different skins - Pirate Stuff is the original, though, and the pirate coat fits the mechanic well enough.

Thick wooden planks bordered by iron bolts enclose the grid, with a sandy beach, open treasure chests, and a lantern flanking the reels. Moonlight cuts through a dark ocean sky behind a distant ship silhouette. The high-value symbols are character portraits - a bearded pirate captain, a red octopus, a scorpion - while the lows are card royals (Q, K, J, A) rendered in a coral-encrusted, barnacle-crusted style that actually looks handmade rather than stock. No buy bonus and no jackpot here, just a base game feeding into that snowball free spins round.