Dyna Mule Slot by AvatarUX

A grizzled brown cartoon mule in a sombrero and a chewed-up cigar stands guard on the left side of the board, dynamite stick in hoof, while the 5x4 grid sits inside a wooden mine-cart frame under hard sunset skies. The setting is signposted up top as "El Dorado Gold Mine, Est. 1874," with mine-shaft headframes, stacks of TNT crates, and railroad track in the distance. Symbols are themed cleanly: gold pickaxes, gold goblet, money bag, jewels on the highs, rusted western-type card royals on the lows. The Wilds Collector sits to the right as a wooden crate labelled BONUS.

The base game runs on 1,024 ways and is built around Moving Wilds. A Wild can land with a small number printed on it, the life counter. Each life is one move it'll make across the board, and every move triggers a free respin. So a Wild with a 4 stays around for four respins, drifting between positions, and during that whole sequence you keep spinning at no cost. Chain-reactions of overlapping Wilds with different counters are where the base game does most of its work.

Three or more Bonus scatters open the Free Spins round, with 7, 9, 12, or 15 spins for 3 to 6 triggers. Inside the bonus, the rules flip. Wilds no longer fire respins. Instead they're collected one by one into the Wilds Collector, up to a cap of 20. New Bonus symbols still keep adding +1 spin each. When the counter hits zero, the FUSE kicks in: any Wild still on screen with lives remaining converts its highest life count into extra spins, which can extend the round multiple times. Once everything is finally exhausted, the Goldsplosion Spin runs: all 20-odd collected Wilds get thrown back onto the board at once, and any that overlap pick up a multiplier worth up to x2 on every way they help build.

For the impatient, Fortune Spin buys in at 60x for the regular bonus and 240x for Bonus Max with 10 spins and the best collector odds. Ante bet is also on the table at 3x cost for five times the Bonus trigger chance. It's a busy western-flavored design that earns its 20,000x cap mostly through the final scattershot of collected Wilds, not the base game grind.