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In page Cooperative board game:

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In many contemporary cooperative games, randomizing devices help in varying game experience over multiple plays. Dice can be rolled, cards can be drawn each turn from a shuffled deck or various board sections of a modular board revealed to generate random objectives, events and challenges. These provide the conflict or challenge in the game, and make it progressively more difficult for the players. For example, in Save the Whales, players work together to protect whales from the challenges inherent in the game setting—radioactive waste, commercial whaling, etc.[1]