Rainbow Riches Fortune Favours Slot by Light & Wonder

The toadstool does the interesting work. That red-cap, white-spotted mushroom is the Magic Fairy, and it's live on every single spin, no scatter count or trigger needed. When the reels stop, if one Magic Fairy is sitting in view it flips into a random symbol. Land several at once and they don't each roll their own result. They all reveal the same symbol, so a scatter of toadstools can suddenly become three or four matching icons strung across the 10 lines for one combined hit. That's the whole reason to watch where they drop.

Everything else around it is classic Rainbow Riches good-luck furniture. The carved-stone royals come in solid blocks of colour, a red A, a blue K, a gold J and a purple 10, sat in an ornate gold border over a rolling green meadow with blue mountains, a wooden fence and wildflowers under a clear sky. A multicolour rainbow arcs in as a high symbol, and the gold-and-green Rainbow Riches logo is the wild, dropping in tall full-reel stacks. It covers everything except the Magic Fairy, so a stacked wild reel plus a few transformed toadstools is where the bigger base-game pays come from.

The optional gear is Big Bet, fired from the BB button and played as four reel sets back to back at fixed stakes from $10 up to $50. The levels stack advantages that carry symbols forward across those four spins. At the lower tiers a Magic Fairy in view transfers to the next set. At $30 the wild switches on and both wild and Magic Fairy carry over. At $40 any revealed wild transfers too. The $50 tier moves everything forward and strips the 10, J and Q symbols clean out of the reels, leaving a richer mix for the four spins. It ends once each of the four reels has run once.

No free spins round, no jackpot, nothing to buy. For a 2018 Light & Wonder Barcrest title that's honest enough, and the single-symbol mystery transform is doing more lifting than most leprechaun slots bother with.