Boo Slot by Big Time Gaming

A foggy graveyard sits behind the reels: jack-o'-lanterns glowing orange, cobwebs strung between bare trees, and a moonlit mansion with a few lit windows off to the side. The four paying symbols are grinning cartoon ghosts in purple, pink, blue and green, cute rather than scary, with the slime-green Boo logo perched top-right. This whole Halloween skin is Big Time Gaming reworking its balloon slot Pop, and the ghosts burst the same cheerful way the balloons did.

Every winning symbol except the pumpkin Scatter pops and is replaced in place, swapped for another ghost, a Scatter, or a Wild. If the new symbols form a fresh win, they pop too, and the chain keeps running until a swap lands nothing. It isn't a tumble where the grid drops down. Positions stay fixed and symbols change where they stand. Because those replacements can arrive as Scatters or Wilds, a single reaction quietly feeds both the bonus trigger and the multipliers that drive the base game.

Wilds only show on the second, third and fourth reels, never the first, and each can appear carrying a multiplier up to x4. Every Wild in a win applies its multiplier, and when two or more land in the same combo those multipliers multiply against each other rather than add. Two x4 Wilds in one payout means x16. Since Wilds turn up through reactions as readily as on the opening drop, a long chain is where the heavier base numbers come from.

Three or more pumpkin Scatters change the scenery. The reels drop into a bubbling cauldron, and every position on the grid gets its own multiplier value attached. Wins still pay left to right the same way, but now they collect whatever multipliers sit beneath the winning ghosts, and several stacking at once is how the 47,050x top payout actually lands. Good luck getting the base reactions anywhere near that on their own.