Codenames

Players: 4-8
Play Time: 20 mins
 
Each team has a Spymaster who must navigate a minefield of words, giving shrewd clues to get their team mates to find the connections between different words.  Rewards creative thinking and getting into your friend's heads.
 
Good for:
Groups that want to team up and play a relaxed but rewarding 'guess the word' game.
 
Description from the publisher:
Codenames is an easy party game to solve puzzles. 
The game is divided into red and blue, each side has a team leader, the team leader's goal is to lead their team to the final victory. 
At the beginning of the game, there will be 25 cards on the table with different words. Each card has a corresponding position, representing different colors. 
Only the team leader can see the color of the card. The team leader should prompt according to the words, let his team members find out the cards of their corresponding colors, and find out all the cards of their own colors to win.
 
 
 
More info at: Board Game Geek