The Nobel Prizes site has several interesting games, though most are not accessible to English Language Learners.  One, though, the Nuclear Weapons Game , would be accessible to high-Intermediate or Advanced students.

In the game, players have to send “peace doves” to certain countries to disarm them.  Clues, and a map, are shown, and the player has to send the dove to the correct country.

I’ve placed the link on my World History page at the bottom of the Toward The Twenty-First Century section.