Read the developer’s release notes
In this update, we’ve introduced two major features: Challenges and Leaderboards. Players can now test their knowledge in daily and weekly trivia challenges across multiple categories (Geography, Animals, History, etc.). After completing a challenge, scores are submitted to Game Center leaderboards, where players can see their global rank as well as compare with friends. We’ve also added a classic all-time leaderboard (“Hall of Brains”) to highlight the top scorers of all time. These features enhance replayability, encourage friendly competition, and give players new reasons to return daily and weekly.
Source: Apple App Store listing.
