Paw Pack Assembl'em uses a card-based system where cards are collected at milestones and can be assigned to Invading Wilds or Extra Wilds features. Each card offers different multiplier and jackpot ranges, which can be upgraded or activated by collecting matching banners on the reels. Invading Wilds duplicate across adjacent reels when stacked, while Extra Wilds add multiple wild symbols. As play continues, more cards unlock through spin counts, Free Spins, or time-based events, remaining accessible for ongoing customization. Free Spins are triggered by activating up to three cards, allowing collection of banners for jackpots. Collecting all five Fire Hydrant banners during Free Spins awards the top 5000x jackpot. Gameplay centers on card collection, wild symbol features, and persistent customization.