Partner Selection in the "Marbles Game"

Players are told to pair up, but given their prior game experiences, they try to choose a partner strategically. The players soon discover that instead of working as a team, they will have to play against their partner in a marble-based game of their choice. No pre-determined rules are given to the players on which game to play with the marbles; instead, players are free to establish their own rules or play their favorite games. Each player is given a bag containing 10 marbles. Whoever acquires all their partner’s marbles within 30 minutes is the winner.