The CNN Challenge Gets Harder on Facebook

The CNN Challenge just got a little more challenging, as CNN announced that it expanded the interactive online news-trivia Facebook app.

Contestants have 45 seconds to answer five questions, with scoring based on how quickly they respond, and users can invite and challenge Facebook friends within the game and on their walls. The CNN Facebook Fan Page will feature a Global Leaderboard, updated weekly, and the app also features a “Go to CNNChallenge.com” button that takes them to the full online version of the game.

Questions are based on historical news events.