Rush Riches Slot by Evoplay

Every spin starts with a mining problem. Between 3 and 15 dark stone blocks sit embedded across the 5x5 grid, each one dead space - no symbol, no payout potential, just fewer ways to win. The grid maxes out at 3,125 ways with all positions open, but a heavy rock distribution on a bad spin chokes that number down to almost nothing. Wins blow up adjacent rocks (not diagonal, only cardinal directions), and the tumble mechanic keeps the chain going without adding new blockers. So one decent hit pulls rocks off the board, which opens ways, which makes the next cascade more likely to connect.

Strip every last rock in a single round and you're into 8 free spins. The bonus replaces rocks with nuggets - silver ones feed a progressive win multiplier at x1 each, gold ones add an extra spin. That multiplier starts at x1 and carries across all 8 spins without resetting, applied to each round's total after cascades finish. Clearing all nuggets during the bonus adds 3 more spins. The 103x buy bonus forces the trigger immediately.

Bonus Chance at 1.8x doubles your odds of a natural free spins entry, though wins are paid on the original bet size. Wilds show up on reels 2 through 5 only, which means reel 1 always needs a paying symbol to start a combination. The high-pay prospector tops the table at 4x for five of a kind per way - small per-way values, but the ways count is what scales them. Warm painted mountains and a weathered copper grid border give it a gold rush postcard look, pine trees and a mine shack filling the background in earthy browns and forest greens.