Codenames

Two  rival spymasters know the secret identities of 25 agents. Their  teammates know the agents only by their codenames — single-word labels  like "disease", "Germany", and "carrot". Yes, carrot. It's a legitimate  codename. Each spymaster wants their team to identify their agents  first...without uncovering the assassin by mistake.

In Codenames, two teams compete to see who  can make contact with all of their agents first. Lay out 25 cards, each  bearing a single word. The spymasters look at a card showing the  identity of each card, then take turns clueing their teammates. A clue  consists of a single word and a number, with the number suggesting how  many cards in play have some association to the given clue word. 

The  teammates then identify one agent they think is on their team; if  they're correct, they can keep guessing up to the stated number of  times; if the agent belongs to the opposing team or is an innocent  bystander, the team's turn ends; and if they fingered the assassin, they  lose the game.Spymasters continue giving clues until one team has identified all of  their agents or the assassin has removed one team from play.