White Rabbit Megaways Slot by Big Time Gaming

When this landed in 2017 it was the first Megaways slot that could grow its own reels, and the first Big Time Gaming release you could buy your way into. The engine behind both is the Cupcake. Every Cupcake that drops gets swapped for two fresh symbols and stretches the reel it sat on by one more position, and reels keep climbing this way until one hits the ceiling of 12 symbols. Get a reel all the way to that full 12 and it hands back a retrigger. In the base game the reels run up to seven high, so the way-count tops out around 16,807, but the Cupcakes are already hinting at what happens once the real round starts.

Three White Rabbit Scatters open the free spins at 15 games. The clever bit is that the symbol counts don't reset between spins. Whatever height each reel reached carries straight into the next one, so the grid only ever grows across the round. Push every reel to 12 and you're playing up to 248,832 ways at once. Any reel that maxes out adds another 3 to 12 spins on top, and the round can retrigger as many as five times, which is how the tallest grids and longest runs come together. The Caterpillar feeds it too, sliding Bonus Wilds onto reels 2 through 5, sometimes as a full-reel wild that covers a whole column top to bottom.

Don't fancy grinding for the Scatters? The Feature Drop button buys the Rabbit Hole free spins outright at 100x your bet, with Feature Drop symbols landing on the reels chipping that price down, and if they knock it to nothing the round just starts by itself. It all plays out in a storybook forest clearing, oversized red-and-white toadstools glowing on a bed of moss, a stone well and a waistcoated rabbit off to one side, and that smoking blue Caterpillar peering out from a mushroom in the corner. The paying symbols stay small and jewel-bright: a dark-haired Queen in a red gown up top, then cut red, blue and green gems set in gold frames, sitting over the card royals.