Citizen! Are you ready to Die2Nite?
A browser game where you join a town with 39 strangers and try to survive as long as possible against endless zombies. The game does a good job of evoking a sense of despair since all towns are doomed to be overrun sooner or later. But in truth, the game is often less about surviving the zombie onslaught than it is about getting all the citizens of your town to work together towards a common goal.
Similar to many other browser games, it's free to play but paying players get many benefits, such as increased item drops and the ability to choose a specific town when starting a new life. The time commitment is pretty low, so you can play successfully even if you only log on for about 20 minutes a day (although you have to be inside town at midnight or the zombies will eat you).
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“Folks say that if you listen real close at the height of the full moon, when the wind is blowin' off Nantucket Sound from the nor' east and the dogs are howlin' for no earthly reason, you can hear the awful screams of the crew of the 'Ellie May,' a sturdy whaler Captained by John McTavish; for it was on just such a night when the rum was flowin' and, Davey Jones be damned, big John brought his men on deck for the first of several screaming contests.”