Gem Splash: Rainbow's Gift Slot by Playtech

A gem tile stamped with a cash prize hangs above the reels, and every spin it slides down one row. Land it directly over one of the green octagonal Gem Splash targets sitting on the grid and it pays the amount printed on its face. Miss, and it doesn't just disappear. The value ticks up before the next drop, so a gem that keeps falling without connecting is worth more by the time it finally hits a target. That falling-gem chase is why you'd spin this, because the line game underneath is quiet. The harp, pipe and horseshoe pay modestly and the A-K-Q-J-10 royals barely move the needle.

Separate from the drops, any spin at any stake can randomly pull you into the Gem Splash jackpot game, and a bigger bet lifts your odds of getting there. That game hands out either a fixed prize worth 10x up to 100x your total bet, or one of three progressives, Minor, Major or Grand. Be aware the three progressives read as "Not available" in the free demo, so those can only land in real-money play.

Three or more pot-of-gold scatters award eight free games, and this is where the board changes shape. It opens at the base four rows and adds a new row every couple of spins, climbing to seven rows and fifty lines before it ends. Bigger gem drops appear too, some of them 2x2 blocks, each worth up to 100x the total bet when it collects. Three more scatters mid-round add another three spins.

The wild is a grinning red-bearded leprechaun clutching a purple gem, and he stands in for everything except the pot of gold. Everything sits inside a green Celtic-knot border over a rainbow arcing across a hazy blue sky, proper leprechaun and pot-of-gold stuff. The base game caps at 480x the bet; the progressive jackpots pay on top of that, and there's no buy feature and no ante, so the gem drops and those three scatters are the only ways in.