What do you think about the board game called the Settlers of Catan?

Settlers of Catan is a multiplayer board game, which is the first German-style board game to achieve popularity outside Europe, and has been called the “killer app” of designer board games. Over 11 million games in the Catan series have been sold, and the game has been translated into twenty-five languages from the original German. The game has rapidly become popular in part because its mechanics are relatively simple, while its dynamics are quite complex.