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. Players work together to
reveal all fifteen agents -- without revealing an assassin --
before time runs out in order to win the game.
Either player can decide to give the first one-word clue to the
other player, along with a number. Whoever receives the clue
places a finger on a card to identify that agent. If correct, they
can attempt to identify another one. If they identify a
bystander, then their guessing time ends. If they identify an
assassin, you both lose! 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.