Global Quiz is an addictive trivia game composed of difficult, ambitious questions. Every answer has an explanation so there is a chance to learn a lot while playing. Similarly to Wikipedia, the questions database is a result of collaborative work of volunteers.
However, behind the game, Global Quiz is also a research project which uses the database of selected answers to create the knowledge maps. The results are available to anyone interested.
The site is using several django add-ons that work well together, including django-subdomains and django-allauth.