Orange lava glows behind a crowded mine shaft, with wooden tracks curling around the edges, barrels stacked beside the rails and a couple of grinning moles in hard hats leaning on their picks. Above the grid sit five barrels marked Mystery, Add, Copy, Boost and Collect, while a board beside it lists the four cash prizes. The bet box in the bottom corner reads 1.00.
Theme and Gameplay
The look is chunky and warm, with every letter chiselled in coloured rock and flecked with gold. Gems come in a rainbow of shades, and glowing yellow nuggets show their cash value in white numbers.
Slot Features
Gems are the centre of attention. A Yellow Gem carries cash: when a Mine Cart rolls under its reel and collects it, it pays 1x, 2x, 3x, 4x, 5x, 7x, 8x or 10x the bet. Carts can arrive under the reels on any spin and take every cash value in the reel above. Inside Hold’n Win, yellow gems can also reach 12x, Mini 15x, Minor 25x, Major 50x or Grand 500x.
The other colours are enhancements. Red is a mystery gem that becomes 10x, 12x, 15x, 25x, 50x or 500x. Pink adds two or three yellow gems worth 5x, 7x, 8x, 10x or 12x, then takes their sum as its own value. Teal copies the highest gem value on the reels. Green boosts all cash values by a random 1x, 2x, 3x, 4x, 5x, 7x or 10x. Blue collects every cash value in view.
Six or more single-coloured gems trigger Hold’n Win. One Burst Gem is enough alone, a multicoloured special that brings the enhancements of the gems it is made from. If nothing triggers while coloured gems sit on the reels, each is dropped into its matching pot above them for another chance.
Hold’n Win begins with 3 respins, and any new gem resets the count. Cash pots appear only here, worth Mini 15x, Minor 25x, Major 50x and Grand 500x, and a completely full screen wins the Grand.
Go Ultra raises the total bet by 50% and leaves line wins untouched. With it on, a triggered feature doubles the jackpots to Grand 1000x, Major 100x, Minor 50x and Mini 30x, and both a Red-Green-Blue gem and a Pink-Teal gem can appear.
RTP and Win Potential
Gems alone cannot be substituted by the miner Wild; everything else can. With a 1.00 bet, five Aces pay 3.00, five Kings or Queens pay 2.00 each, and five Jacks pay 1.00. Ultra adds half the bet on top, so weigh that extra cost against the doubled jackpots. Wins are capped at 10,000x the bet.
My Thoughts On This Slot
Every colour has a clear job, which makes the feature feel more thoughtful than a plain coin collection. The price is a learning curve, since five enhancement types take time to memorise. Simple-line fans may find ordinary spins quiet, while gem-mechanic fans have plenty to follow.
