Rainbow Riches Cluster Magic Slot by Light & Wonder

The board plays a trick most cluster games don't bother with: it grows. You begin with only a small lit patch in the middle of an 8x8 cluster grid, the rest hidden under chunky green stone tiles inside an ornate gold border. Every win you land tumbles the matched symbols away, drops fresh ones in, and knocks loose another concealed section, so the playable area swells outward. Keep the chain going and the grid can open all the way to its full 64 squares. The catch is that it expands across a maximum of six tumbles in a single go, and that ceiling is also your ticket out of the base game.

Six tumbles in a row triggers eight free games on the fully exposed 8x8. Before they begin, a wheel decides which of three modes you'll play, and they are not interchangeable. Persisting Wilds stamps two wilds into fixed spots on every tumble and leaves them anchored for the whole run, so they pile up rather than wash away. Infinity Spins opens on a 1x multiplier that climbs by one with each winning tumble and never drops back, every winning spin tacks on another game up to a 250 ceiling, and the round won't pay you less than 10x your total stake. Wild Rain just scatters wilds across the grid, somewhere between four and sixteen of them, refreshed each game. The wild fills in for any symbol throughout.

You don't have to accept the wheel's pick. A one-time Re-Spin lets you re-roll for a different mode, priced by what you drew first: 8x your bet to ditch Persisting Wilds, 5x to swap out Infinity Spins, and nothing at all to re-roll Wild Rain. It doesn't promise you a different result, just another go at the wheel. UK players don't see this option at all.

The dressing is unmistakable Rainbow Riches luck: a full rainbow arcing over green hills, a thatched cottage tucked to one side, pots of coins spilling at the edges, and a ginger leprechaun in a green top hat winking out from the symbol set alongside clovers, red-capped mushrooms, and faceted gems in magenta, blue, orange and green. Wins ring the clusters in glowing halos before the tiles break and the grid creeps a little wider.