The Fantasy Sports challenge system that Stryking has developed for "Football-Stars" will provide gameplay for the digital collectibles, allowing fans to use non-fungible tokens player cards of real sports stars in special challenges to compete against each other. Users build virtual line-ups with their player cards and play against the line-ups of other users, with results calculated based on real-live results or historical data. This mechanic allows users to increase the value of their player cards, which they can sell on the marketplace.