Bubble Bubble Slot by RealTime Gaming

Three cauldrons appear on a bonus screen, and you pick one. That single choice decides which of three entirely different free games modes plays out, and they behave nothing like each other. Great Ghosts runs 20 spins with up to nine wild ghost symbols scattered across the reels, so wild coverage is the whole point. Wild Witches gives you 9 spins where Winni's spell turns one or two full reels completely wild on each spin, and those wild reels stack with the 50 paylines to produce line wins that look absurd. Bewitched is the odd one out: just 7 spins, but Winni sits permanently on reel 3 as a stacked full-reel wild for the entire round. Fewer spins, guaranteed center-reel wild on every one.

Trigger the bonus with three or more Witch's Cauldron scatters anywhere on the reels. No buy option, no ante bet, just the scatter path.

In the base game, Winni the Witch is the wild and the top-paying symbol at the same time. Landing her on a reel makes her expand to fill the entire column, then she triples any payline win she's part of. Pair that with 50 fixed paylines and one full expanding wild can ripple into dozens of tripled hits in a single spin. A expanding wild on a narrow 5x3 grid hits harder than it sounds.

Visually this is vintage RTG Halloween: a cartoon graveyard under a green mist sky, bare twisted trees, a lantern-eyed owl watching from the branches, and broomsticks leaning against tombstones. The 5x3 grid sits between two cracked stone pillars tagged "50 LINE PLAY" and "HELP & RULES". Symbol art leans into novelty horror more than real horror: jack-o'-lanterns with orange glowing eyes, pink and green bubbling potions, skulls with pink ribbons, spell books literally titled "Love Spells", and Winni herself drawn as a pin-up witch in black stockings perched on a potion jar. Color palette is dark teal, purple, lime green, amber. It's playful and dated in a way that works for the theme.

This is the first entry in RTG's Bubble Bubble trilogy. Bubble Bubble 2 followed in 2017 with Winni's sister Wanda, and Bubble Bubble 3 arrived in 2021 with a reworked feature set. The original still gets regular play on RTG-powered casinos nearly a decade after release, partly because of that three-path bonus structure and partly because the Macbeth witches reference ("double, double toil and trouble") landed so cleanly on a slot.