Double Digger Slot by Playtech

Winning symbols don't settle here. They break apart and drop out, letting fresh ones fall into the gaps, so a single spin can chain into several payouts before the reels go still. The gems doubling as cash coins are where the money gathers. Each one lands stamped with a value, and a collector symbol sweeps up every coin value showing on the board at once. Then the orbs get involved. Blue ones marked +3, +4 or +10 add flat amounts onto the collected pile, while a red x10 orb multiplies the entire haul. Two or three collectors on screen means each of them banks the total separately.

That same coin collection feeds a four-rung progressive ladder running up the left side. Mini pays 20x, Minor 50x, Major 200x, and the Grand sits at 500x. You don't spin for these on a separate wheel, they come out of gathering enough coin value, so the collect mechanic and the top prizes are the same system.

The bonus changes the board's shape. Reels one and two hold their three rows, but the last three stretch up to six rows each, and 243 ways balloons into 1,944. More rows means more room for the gold WILD WILD nugget to swell across a full reel, and landing more bonus symbols during the round buys extra spins on top. It's the most generous the game gets.

There's a catch worth knowing before you toggle the BET MORE WAYS side bet on. It buys you features more often, and it also pulls the win ceiling down well below where the standard game can reach, so you're trading a higher hit rate for a lower top end. The whole thing plays out in a green mountain valley, the reels strung inside a wooden mine-shaft cage, a bearded prospector with a headlamp and pickaxe watching from the edge while gems, dynamite sticks and gold pans tumble past.