There are 3 different types of Rankings that show a Player’s strength and skill. These are shown in the Leaderboard, the High Scores and the Challenge Ranking. The Leaderboard calculates a weighted average of all High Scores across all Quizzes (and Quiz Modes) that you have played, adds them up and then ranks the best Players in the World. The High Scores show which Players are the best for a particular Quiz. The Challenge Ranking shows which Players have accumulated the most points when challenging other Players (Challenges are Quizzes played in groups of 2 to 5 Players). To learn more, check out the Help page.