I recently downloaded a demo version of a game called "DefCon". How could you not be intrigued by a game that where the subtitle is "Everybody Dies"?
Before I go further, here's the link: http://www.everybody-dies.com/
Anyhow, the premise is loosely based on the 1983 film "WarGames" insofar as it's a game of thermonuclear war. And the graphics look a lot the same.
But the game itself is simple but wonderful in the same way that chess has simple rules but complex strategy. A timer inexorably countsdown to DefCon 1 while you madly try to get your forces ready for both offense and defense.
Winning a Strangelovian....your megadeaths versus my megadeaths. Not for the faint of heart.
Concluding: It's a cool game that takes only minutes to play and has some great strategy elements as well as fulfilling the atavistic urge to crush, crumble, and destroy.