Leagues
are collections of questions that are displayed and scored together, much like a fantasy sports league.
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Question series are groups of questions that are thematically related and displayed and scored together. Topics like Obama's cabinet picks, the Oscar winners, a set of economic indicators, or college football bowl games are ideal for question series.
Leagues are collections of one or more series. Participants are ranked based on their accuracy across all of the questions in a series. First, each question is scored individually. Then each participant's scores are aggregated to determine series performance, which is displayed on a leaderboard on each series page.