Rainbow Riches Home Sweet Home Slot by Light & Wonder

Four little arched cottage doors sit in a row above the reels, and learning what they do is the whole reason to play this one. When a cottage trigger symbol lands fully in view on reel one, the green-suited leprechaun knocks and swings open between one and four of those doors. Each door that opens reveals a symbol type, and every copy of that symbol currently on the grid turns wild for the spin. Sometimes a Fairy is waiting behind a door instead, and when she shows up she picks up to five extra reel positions and turns those wild too. So a single knock can flood the board with wilds in a way you have no control over but plenty to gain from.

The leprechaun himself does double duty. Any leprechaun in view, even one only half-showing at the edge, counts as a wild and stands in for everything. Three of him landing fully on reels one, three and five is what opens the eight-spin bonus. Here's the clever bit that ties the two features together: whatever wilds the Knock-Knock doors created on the spin that triggered the round get frozen in place and re-stamped onto all eight free spins. You carry that wild pattern through the entire feature, and landing three more leprechauns inside the round adds another eight on top. Those held wilds are what separate a flat bonus from a runaway one.

There's no buy option. The closest thing is Big Bet, a five-spin package at one of three fixed high stakes. The cheapest just nudges a part-shown reel-one leprechaun into full view for more door triggers. The middle tier strips the low card symbols off the reels entirely. The top tier stretches the reel-one leprechaun to a full five symbols tall and guarantees at least two doors open on every knock.

It all plays out in a sunny Irish woodland glade, the grid built as a carved wooden, vine-woven border resting on a tree stump, with glossy 3D horseshoes, harps, keys and crosses sharing the reels with painted J and K royals. Warm greens, gold and red, storybook through and through.