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Codenames Duet keeps the basic elements of Codenames — give one-word clues to try to get someone to identify your agents among those on the table — but now you're working together as a team to find all of your agents. (Why you don't already know who your agents are is a question that Congressional investigators will get on your back about later!)
Unlike regular Codenames, they can keep guessing as long as they keep identifying an agent each time; this is useful for going back to previous clues and finding ones they missed earlier. After the first clue is given, players alternate giving clues.