The Duel of Civilizations (not final name) combines the classical turn-based strategy game battles for territories with a Trivia Quiz game, where the questions aren't at all trivial. The multiple teams can gather and compete at one computer, as well as do it remotely (multiplayer mode). The game can entertain and educate the interested ones for multiple ours, because the maps are procedurally generated and the question packages will be extended periodically.
*It is still under development. (networking, AI and other features still to be added.)