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Upgrading collectors add nice progression. Fire in the Hole 3's Lucky Cart starts basic, collecting coins each spin, but upgrades in higher bonuses to persistent across spins or even multiplier versions. Stays active while xBombs clear and refill. Full upgrade path visible in demo https://fireinthehole3demo.com/ direct buys let you jump tiers too. Wild miners drill extra values, Beer Wilds help connections. Extreme vol, but cart persistence turns quiet bonuses into monsters. 60k max, dwarf crew reacts to each upgrade with growing excitement.