We play this game on the first day of our Survey of English-Speaking Countries class. The students love it.
Basically, students divide into two or three teams and then take turns choosing a topic and level of difficulty (like Jeopardy). They then see a picture or question that corresponds to their choice and they must identify which country matches with the picture or question. I sometimes give them bonus points if they can give me more information (eg. the name of the animal in the picture, a movie that the pictured actor has starred in, etc.).
To download the PowerPoint game, click here: English Countries Game