Big Fish Casino’s Buffalo Gold Stampede Anniversary Edition is the first time we’ve seen a machine let players use app-wide currency to buy enhancements for a bonus. At the start of free spins, players can buy three tiers of chests that grant three random enhancements. With chests that cost $5–$25 worth of currency and produce over 50 unique combinations of enhancements, this mechanic has the potential to be a major revenue driver if introduced across multiple machines.