Digger's Dough Slot by Relax Gaming

Two rows up top, three rows down below, and the rules say the two halves never mix. Block symbols only land on the upper two rows. Paying symbols only land on the bottom three. A spin starts as a frozen-looking 5x5 grid where you can see the entire block layout in advance, which means you can read what's about to happen before the reels resolve - if a row of multiplier blocks is sitting overhead, you know what's at stake.

Wins form via scatter pays. Four or more matching symbols anywhere on the bottom three rows count as a hit, and winning symbols cascade out for replacements. The trick is that any winning symbol landing directly under a block activates that block. An empty block just shatters. A multiplier block stamps its value (x2, x3, x5, x10, x50, x100, x500) onto the round's Total Multiplier counter, which starts at zero and grows as more multiplier blocks light up. Bonus blocks worth 1, 2 or 3 each accumulate toward Free Spins - hit three or more in the same round to trigger the bonus, with the count summed (so 1+1+3 awards five spins, not three). Destroyer blocks - horizontal, vertical, diagonal - clear chunks of the grid in patterns that can chain into other blocks. The colored gem blocks are nastier: a Red Gem block detonates every red-class symbol on the reels, then forces the next cascade to drop only red-class symbols, basically guaranteeing follow-up hits.

Free Spins inherit the Total Multiplier from the trigger spin, and the multiplier does not reset between spins inside the bonus. Super Free Spins is a rarer randomly-awarded variant where the upper rows only spawn multiplier, bonus, and gem blocks, no empties or destroyers - five spins of guaranteed value-dropping pieces. Two more secondary features kick in if you ever clear all blocks in a single cascade (only good blocks land for the rest of the round) or destroy every paying symbol at once (next cascade fills with one kind only). Cap is 10,000x bet.

Buy Free Spins runs at 71x bet for the standard variant - awards 3 to 10 random spins but cannot trigger Super FS - or 256x bet for guaranteed Super Free Spins. Setting is a daytime mining camp with a wooden mineshaft frame, log carts, and pine trees behind the reels. Symbols lean cartoon: a bearded miner in a yellow helmet, mining cart, crossed picks, dynamite, plus colored gems for the lows. Cheerful rather than gritty - the kind of mining theme that wants you to like the prospector.